text: /*
  Copyright (c) 2010, Yahoo! Inc. All rights reserved.
  Code licensed under the BSD License:
  http://developer.yahoo.net/yui/license.txt
  version: 2.7.0r2
  */
  /**
   * The drag and drop utility provides a framework for building drag and drop
   * applications.  In addition to enabling drag and drop for specific elements,
   * the drag and drop elements are tracked by the manager class, and the
   * interactions between the various elements are tracked during the drag and
   * the implementing code is notified about these important moments.
   * @module dragdrop
   * @title Drag and Drop
   * @requires yahoo,dom,event
   * @namespace YAHOO.util
   */
  
  // Only load the library once.  Rewriting the manager class would orphan 
  // existing drag and drop instances.
  if (!YAHOO.util.DragDropMgr) {
  
  /**
   * DragDropMgr is a singleton that tracks the element interaction for 
   * all DragDrop items in the window.  Generally, you will not call 
   * this class directly, but it does have helper methods that could 
   * be useful in your DragDrop implementations.
   * @class DragDropMgr
   * @static
   */
  YAHOO.util.DragDropMgr = function() {
  
      var Event = YAHOO.util.Event,
          Dom = YAHOO.util.Dom;
  
      return {
          /**
          * This property is used to turn on global use of the shim element on all DragDrop instances, defaults to false for backcompat. (Use: YAHOO.util.DDM.useShim = true)
          * @property useShim
          * @type Boolean
          * @static
          */
          useShim: false,
          /**
          * This property is used to determine if the shim is active over the screen, default false.
          * @private
          * @property _shimActive
          * @type Boolean
          * @static
          */
          _shimActive: false,
          /**
          * This property is used when useShim is set on a DragDrop object to store the current state of DDM.useShim so it can be reset when a drag operation is done.
          * @private
          * @property _shimState
          * @type Boolean
          * @static
          */
          _shimState: false,
          /**
          * This property is used when useShim is set to true, it will set the opacity on the shim to .5 for debugging. Use: (YAHOO.util.DDM._debugShim = true;)
          * @private
          * @property _debugShim
          * @type Boolean
          * @static
          */
          _debugShim: false,
          /**
          * This method will create a shim element (giving it the id of yui-ddm-shim), it also attaches the mousemove and mouseup listeners to it and attaches a scroll listener on the window
          * @private
          * @method _sizeShim
          * @static
          */
          _createShim: function() {
              YAHOO.log('Creating Shim Element', 'info', 'DragDropMgr');
              var s = document.createElement('div');
              s.id = 'yui-ddm-shim';
              if (document.body.firstChild) {
                  document.body.insertBefore(s, document.body.firstChild);
              } else {
                  document.body.appendChild(s);
              }
              s.style.display = 'none';
              s.style.backgroundColor = 'red';
              s.style.position = 'absolute';
              s.style.zIndex = '99999';
              Dom.setStyle(s, 'opacity', '0');
              this._shim = s;
              Event.on(s, "mouseup",   this.handleMouseUp, this, true);
              Event.on(s, "mousemove", this.handleMouseMove, this, true);
              Event.on(window, 'scroll', this._sizeShim, this, true);
          },
          /**
          * This method will size the shim, called from activate and on window scroll event
          * @private
          * @method _sizeShim
          * @static
          */
          _sizeShim: function() {
              if (this._shimActive) {
                  YAHOO.log('Sizing Shim', 'info', 'DragDropMgr');
                  var s = this._shim;
                  s.style.height = Dom.getDocumentHeight() + 'px';
                  s.style.width = Dom.getDocumentWidth() + 'px';
                  s.style.top = '0';
                  s.style.left = '0';
              }
          },
          /**
          * This method will create the shim element if needed, then show the shim element, size the element and set the _shimActive property to true
          * @private
          * @method _activateShim
          * @static
          */
          _activateShim: function() {
              if (this.useShim) {
                  YAHOO.log('Activating Shim', 'info', 'DragDropMgr');
                  if (!this._shim) {
                      this._createShim();
                  }
                  this._shimActive = true;
                  var s = this._shim,
                      o = '0';
                  if (this._debugShim) {
                      o = '.5';
                  }
                  Dom.setStyle(s, 'opacity', o);
                  this._sizeShim();
                  s.style.display = 'block';
              }
          },
          /**
          * This method will hide the shim element and set the _shimActive property to false
          * @private
          * @method _deactivateShim
          * @static
          */
          _deactivateShim: function() {
              YAHOO.log('Deactivating Shim', 'info', 'DragDropMgr');
              this._shim.style.display = 'none';
              this._shimActive = false;
          },
          /**
          * The HTML element created to use as a shim over the document to track mouse movements
          * @private
          * @property _shim
          * @type HTMLElement
          * @static
          */
          _shim: null,
          /**
           * Two dimensional Array of registered DragDrop objects.  The first 
           * dimension is the DragDrop item group, the second the DragDrop 
           * object.
           * @property ids
           * @type {string: string}
           * @private
           * @static
           */
          ids: {},
  
          /**
           * Array of element ids defined as drag handles.  Used to determine 
           * if the element that generated the mousedown event is actually the 
           * handle and not the html element itself.
           * @property handleIds
           * @type {string: string}
           * @private
           * @static
           */
          handleIds: {},
  
          /**
           * the DragDrop object that is currently being dragged
           * @property dragCurrent
           * @type DragDrop
           * @private
           * @static
           **/
          dragCurrent: null,
  
          /**
           * the DragDrop object(s) that are being hovered over
           * @property dragOvers
           * @type Array
           * @private
           * @static
           */
          dragOvers: {},
  
          /**
           * the X distance between the cursor and the object being dragged
           * @property deltaX
           * @type int
           * @private
           * @static
           */
          deltaX: 0,
  
          /**
           * the Y distance between the cursor and the object being dragged
           * @property deltaY
           * @type int
           * @private
           * @static
           */
          deltaY: 0,
  
          /**
           * Flag to determine if we should prevent the default behavior of the
           * events we define. By default this is true, but this can be set to 
           * false if you need the default behavior (not recommended)
           * @property preventDefault
           * @type boolean
           * @static
           */
          preventDefault: true,
  
          /**
           * Flag to determine if we should stop the propagation of the events 
           * we generate. This is true by default but you may want to set it to
           * false if the html element contains other features that require the
           * mouse click.
           * @property stopPropagation
           * @type boolean
           * @static
           */
          stopPropagation: true,
  
          /**
           * Internal flag that is set to true when drag and drop has been
           * initialized
           * @property initialized
           * @private
           * @static
           */
          initialized: false,
  
          /**
           * All drag and drop can be disabled.
           * @property locked
           * @private
           * @static
           */
          locked: false,
  
          /**
           * Provides additional information about the the current set of
           * interactions.  Can be accessed from the event handlers. It
           * contains the following properties:
           *
           *       out:       onDragOut interactions
           *       enter:     onDragEnter interactions
           *       over:      onDragOver interactions
           *       drop:      onDragDrop interactions
           *       point:     The location of the cursor
           *       draggedRegion: The location of dragged element at the time
           *                      of the interaction
           *       sourceRegion: The location of the source elemtn at the time
           *                     of the interaction
           *       validDrop: boolean
           * @property interactionInfo
           * @type object
           * @static
           */
          interactionInfo: null,
  
          /**
           * Called the first time an element is registered.
           * @method init
           * @private
           * @static
           */
          init: function() {
              this.initialized = true;
          },
  
          /**
           * In point mode, drag and drop interaction is defined by the 
           * location of the cursor during the drag/drop
           * @property POINT
           * @type int
           * @static
           * @final
           */
          POINT: 0,
  
          /**
           * In intersect mode, drag and drop interaction is defined by the 
           * cursor position or the amount of overlap of two or more drag and 
           * drop objects.
           * @property INTERSECT
           * @type int
           * @static
           * @final
           */
          INTERSECT: 1,
  
          /**
           * In intersect mode, drag and drop interaction is defined only by the 
           * overlap of two or more drag and drop objects.
           * @property STRICT_INTERSECT
           * @type int
           * @static
           * @final
           */
          STRICT_INTERSECT: 2,
  
          /**
           * The current drag and drop mode.  Default: POINT
           * @property mode
           * @type int
           * @static
           */
          mode: 0,
  
          /**
           * Runs method on all drag and drop objects
           * @method _execOnAll
           * @private
           * @static
           */
          _execOnAll: function(sMethod, args) {
              for (var i in this.ids) {
                  for (var j in this.ids[i]) {
                      var oDD = this.ids[i][j];
                      if (! this.isTypeOfDD(oDD)) {
                          continue;
                      }
                      oDD[sMethod].apply(oDD, args);
                  }
              }
          },
  
          /**
           * Drag and drop initialization.  Sets up the global event handlers
           * @method _onLoad
           * @private
           * @static
           */
          _onLoad: function() {
  
              this.init();
  
              YAHOO.log("DragDropMgr onload", "info", "DragDropMgr");
              Event.on(document, "mouseup",   this.handleMouseUp, this, true);
              Event.on(document, "mousemove", this.handleMouseMove, this, true);
              Event.on(window,   "unload",    this._onUnload, this, true);
              Event.on(window,   "resize",    this._onResize, this, true);
              // Event.on(window,   "mouseout",    this._test);
  
          },
  
          /**
           * Reset constraints on all drag and drop objs
           * @method _onResize
           * @private
           * @static
           */
          _onResize: function(e) {
              YAHOO.log("window resize", "info", "DragDropMgr");
              this._execOnAll("resetConstraints", []);
          },
  
          /**
           * Lock all drag and drop functionality
           * @method lock
           * @static
           */
          lock: function() { this.locked = true; },
  
          /**
           * Unlock all drag and drop functionality
           * @method unlock
           * @static
           */
          unlock: function() { this.locked = false; },
  
          /**
           * Is drag and drop locked?
           * @method isLocked
           * @return {boolean} True if drag and drop is locked, false otherwise.
           * @static
           */
          isLocked: function() { return this.locked; },
  
          /**
           * Location cache that is set for all drag drop objects when a drag is
           * initiated, cleared when the drag is finished.
           * @property locationCache
           * @private
           * @static
           */
          locationCache: {},
  
          /**
           * Set useCache to false if you want to force object the lookup of each
           * drag and drop linked element constantly during a drag.
           * @property useCache
           * @type boolean
           * @static
           */
          useCache: true,
  
          /**
           * The number of pixels that the mouse needs to move after the 
           * mousedown before the drag is initiated.  Default=3;
           * @property clickPixelThresh
           * @type int
           * @static
           */
          clickPixelThresh: 3,
  
          /**
           * The number of milliseconds after the mousedown event to initiate the
           * drag if we don't get a mouseup event. Default=1000
           * @property clickTimeThresh
           * @type int
           * @static
           */
          clickTimeThresh: 1000,
  
          /**
           * Flag that indicates that either the drag pixel threshold or the 
           * mousdown time threshold has been met
           * @property dragThreshMet
           * @type boolean
           * @private
           * @static
           */
          dragThreshMet: false,
  
          /**
           * Timeout used for the click time threshold
           * @property clickTimeout
           * @type Object
           * @private
           * @static
           */
          clickTimeout: null,
  
          /**
           * The X position of the mousedown event stored for later use when a 
           * drag threshold is met.
           * @property startX
           * @type int
           * @private
           * @static
           */
          startX: 0,
  
          /**
           * The Y position of the mousedown event stored for later use when a 
           * drag threshold is met.
           * @property startY
           * @type int
           * @private
           * @static
           */
          startY: 0,
  
          /**
           * Flag to determine if the drag event was fired from the click timeout and
           * not the mouse move threshold.
           * @property fromTimeout
           * @type boolean
           * @private
           * @static
           */
          fromTimeout: false,
  
          /**
           * Each DragDrop instance must be registered with the DragDropMgr.  
           * This is executed in DragDrop.init()
           * @method regDragDrop
           * @param {DragDrop} oDD the DragDrop object to register
           * @param {String} sGroup the name of the group this element belongs to
           * @static
           */
          regDragDrop: function(oDD, sGroup) {
              if (!this.initialized) { this.init(); }
              
              if (!this.ids[sGroup]) {
                  this.ids[sGroup] = {};
              }
              this.ids[sGroup][oDD.id] = oDD;
          },
  
          /**
           * Removes the supplied dd instance from the supplied group. Executed
           * by DragDrop.removeFromGroup, so don't call this function directly.
           * @method removeDDFromGroup
           * @private
           * @static
           */
          removeDDFromGroup: function(oDD, sGroup) {
              if (!this.ids[sGroup]) {
                  this.ids[sGroup] = {};
              }
  
              var obj = this.ids[sGroup];
              if (obj && obj[oDD.id]) {
                  delete obj[oDD.id];
              }
          },
  
          /**
           * Unregisters a drag and drop item.  This is executed in 
           * DragDrop.unreg, use that method instead of calling this directly.
           * @method _remove
           * @private
           * @static
           */
          _remove: function(oDD) {
              for (var g in oDD.groups) {
                  if (g) {
                      var item = this.ids[g];
                      if (item && item[oDD.id]) {
                          delete item[oDD.id];
                      }
                  }
                  
              }
              delete this.handleIds[oDD.id];
          },
  
          /**
           * Each DragDrop handle element must be registered.  This is done
           * automatically when executing DragDrop.setHandleElId()
           * @method regHandle
           * @param {String} sDDId the DragDrop id this element is a handle for
           * @param {String} sHandleId the id of the element that is the drag 
           * handle
           * @static
           */
          regHandle: function(sDDId, sHandleId) {
              if (!this.handleIds[sDDId]) {
                  this.handleIds[sDDId] = {};
              }
              this.handleIds[sDDId][sHandleId] = sHandleId;
          },
  
          /**
           * Utility function to determine if a given element has been 
           * registered as a drag drop item.
           * @method isDragDrop
           * @param {String} id the element id to check
           * @return {boolean} true if this element is a DragDrop item, 
           * false otherwise
           * @static
           */
          isDragDrop: function(id) {
              return ( this.getDDById(id) ) ? true : false;
          },
  
          /**
           * Returns the drag and drop instances that are in all groups the
           * passed in instance belongs to.
           * @method getRelated
           * @param {DragDrop} p_oDD the obj to get related data for
           * @param {boolean} bTargetsOnly if true, only return targetable objs
           * @return {DragDrop[]} the related instances
           * @static
           */
          getRelated: function(p_oDD, bTargetsOnly) {
              var oDDs = [];
              for (var i in p_oDD.groups) {
                  for (var j in this.ids[i]) {
                      var dd = this.ids[i][j];
                      if (! this.isTypeOfDD(dd)) {
                          continue;
                      }
                      if (!bTargetsOnly || dd.isTarget) {
                          oDDs[oDDs.length] = dd;
                      }
                  }
              }
  
              return oDDs;
          },
  
          /**
           * Returns true if the specified dd target is a legal target for 
           * the specifice drag obj
           * @method isLegalTarget
           * @param {DragDrop} the drag obj
           * @param {DragDrop} the target
           * @return {boolean} true if the target is a legal target for the 
           * dd obj
           * @static
           */
          isLegalTarget: function (oDD, oTargetDD) {
              var targets = this.getRelated(oDD, true);
              for (var i=0, len=targets.length;i<len;++i) {
                  if (targets[i].id == oTargetDD.id) {
                      return true;
                  }
              }
  
              return false;
          },
  
          /**
           * My goal is to be able to transparently determine if an object is
           * typeof DragDrop, and the exact subclass of DragDrop.  typeof 
           * returns "object", oDD.constructor.toString() always returns
           * "DragDrop" and not the name of the subclass.  So for now it just
           * evaluates a well-known variable in DragDrop.
           * @method isTypeOfDD
           * @param {Object} the object to evaluate
           * @return {boolean} true if typeof oDD = DragDrop
           * @static
           */
          isTypeOfDD: function (oDD) {
              return (oDD && oDD.__ygDragDrop);
          },
  
          /**
           * Utility function to determine if a given element has been 
           * registered as a drag drop handle for the given Drag Drop object.
           * @method isHandle
           * @param {String} id the element id to check
           * @return {boolean} true if this element is a DragDrop handle, false 
           * otherwise
           * @static
           */
          isHandle: function(sDDId, sHandleId) {
              return ( this.handleIds[sDDId] && 
                              this.handleIds[sDDId][sHandleId] );
          },
  
          /**
           * Returns the DragDrop instance for a given id
           * @method getDDById
           * @param {String} id the id of the DragDrop object
           * @return {DragDrop} the drag drop object, null if it is not found
           * @static
           */
          getDDById: function(id) {
              for (var i in this.ids) {
                  if (this.ids[i][id]) {
                      return this.ids[i][id];
                  }
              }
              return null;
          },
  
          /**
           * Fired after a registered DragDrop object gets the mousedown event.
           * Sets up the events required to track the object being dragged
           * @method handleMouseDown
           * @param {Event} e the event
           * @param oDD the DragDrop object being dragged
           * @private
           * @static
           */
          handleMouseDown: function(e, oDD) {
              //this._activateShim();
  
              this.currentTarget = YAHOO.util.Event.getTarget(e);
  
              this.dragCurrent = oDD;
  
              var el = oDD.getEl();
  
              // track start position
              this.startX = YAHOO.util.Event.getPageX(e);
              this.startY = YAHOO.util.Event.getPageY(e);
  
              this.deltaX = this.startX - el.offsetLeft;
              this.deltaY = this.startY - el.offsetTop;
  
              this.dragThreshMet = false;
  
              this.clickTimeout = setTimeout( 
                      function() { 
                          var DDM = YAHOO.util.DDM;
                          DDM.startDrag(DDM.startX, DDM.startY);
                          DDM.fromTimeout = true;
                      }, 
                      this.clickTimeThresh );
          },
  
          /**
           * Fired when either the drag pixel threshold or the mousedown hold 
           * time threshold has been met.
           * @method startDrag
           * @param x {int} the X position of the original mousedown
           * @param y {int} the Y position of the original mousedown
           * @static
           */
          startDrag: function(x, y) {
              if (this.dragCurrent && this.dragCurrent.useShim) {
                  this._shimState = this.useShim;
                  this.useShim = true;
              }
              this._activateShim();
              YAHOO.log("firing drag start events", "info", "DragDropMgr");
              clearTimeout(this.clickTimeout);
              var dc = this.dragCurrent;
              if (dc && dc.events.b4StartDrag) {
                  dc.b4StartDrag(x, y);
                  dc.fireEvent('b4StartDragEvent', { x: x, y: y });
              }
              if (dc && dc.events.startDrag) {
                  dc.startDrag(x, y);
                  dc.fireEvent('startDragEvent', { x: x, y: y });
              }
              this.dragThreshMet = true;
          },
  
          /**
           * Internal function to handle the mouseup event.  Will be invoked 
           * from the context of the document.
           * @method handleMouseUp
           * @param {Event} e the event
           * @private
           * @static
           */
          handleMouseUp: function(e) {
              if (this.dragCurrent) {
                  clearTimeout(this.clickTimeout);
  
                  if (this.dragThreshMet) {
                      YAHOO.log("mouseup detected - completing drag", "info", "DragDropMgr");
                      if (this.fromTimeout) {
                          YAHOO.log('fromTimeout is true (mouse didn\'t move), call handleMouseMove so we can get the dragOver event', 'info', 'DragDropMgr');
                          this.fromTimeout = false;
                          this.handleMouseMove(e);
                      }
                      this.fromTimeout = false;
                      this.fireEvents(e, true);
                  } else {
                      YAHOO.log("drag threshold not met", "info", "DragDropMgr");
                  }
  
                  this.stopDrag(e);
  
                  this.stopEvent(e);
              }
          },
  
          /**
           * Utility to stop event propagation and event default, if these 
           * features are turned on.
           * @method stopEvent
           * @param {Event} e the event as returned by this.getEvent()
           * @static
           */
          stopEvent: function(e) {
              if (this.stopPropagation) {
                  YAHOO.util.Event.stopPropagation(e);
              }
  
              if (this.preventDefault) {
                  YAHOO.util.Event.preventDefault(e);
              }
          },
  
          /** 
           * Ends the current drag, cleans up the state, and fires the endDrag
           * and mouseUp events.  Called internally when a mouseup is detected
           * during the drag.  Can be fired manually during the drag by passing
           * either another event (such as the mousemove event received in onDrag)
           * or a fake event with pageX and pageY defined (so that endDrag and
           * onMouseUp have usable position data.).  Alternatively, pass true
           * for the silent parameter so that the endDrag and onMouseUp events
           * are skipped (so no event data is needed.)
           *
           * @method stopDrag
           * @param {Event} e the mouseup event, another event (or a fake event) 
           *                  with pageX and pageY defined, or nothing if the 
           *                  silent parameter is true
           * @param {boolean} silent skips the enddrag and mouseup events if true
           * @static
           */
          stopDrag: function(e, silent) {
              // YAHOO.log("mouseup - removing event handlers");
              var dc = this.dragCurrent;
              // Fire the drag end event for the item that was dragged
              if (dc && !silent) {
                  if (this.dragThreshMet) {
                      YAHOO.log("firing endDrag events", "info", "DragDropMgr");
                      if (dc.events.b4EndDrag) {
                          dc.b4EndDrag(e);
                          dc.fireEvent('b4EndDragEvent', { e: e });
                      }
                      if (dc.events.endDrag) {
                          dc.endDrag(e);
                          dc.fireEvent('endDragEvent', { e: e });
                      }
                  }
                  if (dc.events.mouseUp) {
                      YAHOO.log("firing dragdrop onMouseUp event", "info", "DragDropMgr");
                      dc.onMouseUp(e);
                      dc.fireEvent('mouseUpEvent', { e: e });
                  }
              }
  
              if (this._shimActive) {
                  this._deactivateShim();
                  if (this.dragCurrent && this.dragCurrent.useShim) {
                      this.useShim = this._shimState;
                      this._shimState = false;
                  }
              }
  
              this.dragCurrent = null;
              this.dragOvers = {};
          },
  
          /** 
           * Internal function to handle the mousemove event.  Will be invoked 
           * from the context of the html element.
           *
           * @TODO figure out what we can do about mouse events lost when the 
           * user drags objects beyond the window boundary.  Currently we can 
           * detect this in internet explorer by verifying that the mouse is 
           * down during the mousemove event.  Firefox doesn't give us the 
           * button state on the mousemove event.
           * @method handleMouseMove
           * @param {Event} e the event
           * @private
           * @static
           */
          handleMouseMove: function(e) {
              //YAHOO.log("handlemousemove");
  
              var dc = this.dragCurrent;
              if (dc) {
                  // YAHOO.log("no current drag obj");
  
                  // var button = e.which || e.button;
                  // YAHOO.log("which: " + e.which + ", button: "+ e.button);
  
                  // check for IE mouseup outside of page boundary
                  if (YAHOO.util.Event.isIE && !e.button) {
                      YAHOO.log("button failure", "info", "DragDropMgr");
                      this.stopEvent(e);
                      return this.handleMouseUp(e);
                  } else {
                      if (e.clientX < 0 || e.clientY < 0) {
                          //This will stop the element from leaving the viewport in FF, Opera & Safari
                          //Not turned on yet
                          //YAHOO.log("Either clientX or clientY is negative, stop the event.", "info", "DragDropMgr");
                          //this.stopEvent(e);
                          //return false;
                      }
                  }
  
                  if (!this.dragThreshMet) {
                      var diffX = Math.abs(this.startX - YAHOO.util.Event.getPageX(e));
                      var diffY = Math.abs(this.startY - YAHOO.util.Event.getPageY(e));
                      // YAHOO.log("diffX: " + diffX + "diffY: " + diffY);
                      if (diffX > this.clickPixelThresh || 
                                  diffY > this.clickPixelThresh) {
                          YAHOO.log("pixel threshold met", "info", "DragDropMgr");
                          this.startDrag(this.startX, this.startY);
                      }
                  }
  
                  if (this.dragThreshMet) {
                      if (dc && dc.events.b4Drag) {
                          dc.b4Drag(e);
                          dc.fireEvent('b4DragEvent', { e: e});
                      }
                      if (dc && dc.events.drag) {
                          dc.onDrag(e);
                          dc.fireEvent('dragEvent', { e: e});
                      }
                      if (dc) {
                          this.fireEvents(e, false);
                      }
                  }
  
                  this.stopEvent(e);
              }
          },
          
          /**
           * Iterates over all of the DragDrop elements to find ones we are 
           * hovering over or dropping on
           * @method fireEvents
           * @param {Event} e the event
           * @param {boolean} isDrop is this a drop op or a mouseover op?
           * @private
           * @static
           */
          fireEvents: function(e, isDrop) {
              var dc = this.dragCurrent;
  
              // If the user did the mouse up outside of the window, we could 
              // get here even though we have ended the drag.
              // If the config option dragOnly is true, bail out and don't fire the events
              if (!dc || dc.isLocked() || dc.dragOnly) {
                  return;
              }
  
              var x = YAHOO.util.Event.getPageX(e),
                  y = YAHOO.util.Event.getPageY(e),
                  pt = new YAHOO.util.Point(x,y),
                  pos = dc.getTargetCoord(pt.x, pt.y),
                  el = dc.getDragEl(),
                  events = ['out', 'over', 'drop', 'enter'],
                  curRegion = new YAHOO.util.Region( pos.y, 
                                                 pos.x + el.offsetWidth,
                                                 pos.y + el.offsetHeight, 
                                                 pos.x ),
              
                  oldOvers = [], // cache the previous dragOver array
                  inGroupsObj  = {},
                  inGroups  = [],
                  data = {
                      outEvts: [],
                      overEvts: [],
                      dropEvts: [],
                      enterEvts: []
                  };
  
  
              // Check to see if the object(s) we were hovering over is no longer 
              // being hovered over so we can fire the onDragOut event
              for (var i in this.dragOvers) {
  
                  var ddo = this.dragOvers[i];
  
                  if (! this.isTypeOfDD(ddo)) {
                      continue;
                  }
                  if (! this.isOverTarget(pt, ddo, this.mode, curRegion)) {
                      data.outEvts.push( ddo );
                  }
  
                  oldOvers[i] = true;
                  delete this.dragOvers[i];
              }
  
              for (var sGroup in dc.groups) {
                  // YAHOO.log("Processing group " + sGroup);
                  
                  if ("string" != typeof sGroup) {
                      continue;
                  }
  
                  for (i in this.ids[sGroup]) {
                      var oDD = this.ids[sGroup][i];
                      if (! this.isTypeOfDD(oDD)) {
                          continue;
                      }
  
                      if (oDD.isTarget && !oDD.isLocked() && oDD != dc) {
                          if (this.isOverTarget(pt, oDD, this.mode, curRegion)) {
                              inGroupsObj[sGroup] = true;
                              // look for drop interactions
                              if (isDrop) {
                                  data.dropEvts.push( oDD );
                              // look for drag enter and drag over interactions
                              } else {
  
                                  // initial drag over: dragEnter fires
                                  if (!oldOvers[oDD.id]) {
                                      data.enterEvts.push( oDD );
                                  // subsequent drag overs: dragOver fires
                                  } else {
                                      data.overEvts.push( oDD );
                                  }
  
                                  this.dragOvers[oDD.id] = oDD;
                              }
                          }
                      }
                  }
              }
  
              this.interactionInfo = {
                  out:       data.outEvts,
                  enter:     data.enterEvts,
                  over:      data.overEvts,
                  drop:      data.dropEvts,
                  point:     pt,
                  draggedRegion:    curRegion,
                  sourceRegion: this.locationCache[dc.id],
                  validDrop: isDrop
              };
  
              
              for (var inG in inGroupsObj) {
                  inGroups.push(inG);
              }
  
              // notify about a drop that did not find a target
              if (isDrop && !data.dropEvts.length) {
                  YAHOO.log(dc.id + " dropped, but not on a target", "info", "DragDropMgr");
                  this.interactionInfo.validDrop = false;
                  if (dc.events.invalidDrop) {
                      dc.onInvalidDrop(e);
                      dc.fireEvent('invalidDropEvent', { e: e });
                  }
              }
              for (i = 0; i < events.length; i++) {
                  var tmp = null;
                  if (data[events[i] + 'Evts']) {
                      tmp = data[events[i] + 'Evts'];
                  }
                  if (tmp && tmp.length) {
                      var type = events[i].charAt(0).toUpperCase() + events[i].substr(1),
                          ev = 'onDrag' + type,
                          b4 = 'b4Drag' + type,
                          cev = 'drag' + type + 'Event',
                          check = 'drag' + type;
                      if (this.mode) {
                          YAHOO.log(dc.id + ' ' + ev + ': ' + tmp, "info", "DragDropMgr");
                          if (dc.events[b4]) {
                              dc[b4](e, tmp, inGroups);
                              dc.fireEvent(b4 + 'Event', { event: e, info: tmp, group: inGroups });
                              
                          }
                          if (dc.events[check]) {
                              dc[ev](e, tmp, inGroups);
                              dc.fireEvent(cev, { event: e, info: tmp, group: inGroups });
                          }
                      } else {
                          for (var b = 0, len = tmp.length; b < len; ++b) {
                              YAHOO.log(dc.id + ' ' + ev + ': ' + tmp[b].id, "info", "DragDropMgr");
                              if (dc.events[b4]) {
                                  dc[b4](e, tmp[b].id, inGroups[0]);
                                  dc.fireEvent(b4 + 'Event', { event: e, info: tmp[b].id, group: inGroups[0] });
                              }
                              if (dc.events[check]) {
                                  dc[ev](e, tmp[b].id, inGroups[0]);
                                  dc.fireEvent(cev, { event: e, info: tmp[b].id, group: inGroups[0] });
                              }
                          }
                      }
                  }
              }
          },
  
          /**
           * Helper function for getting the best match from the list of drag 
           * and drop objects returned by the drag and drop events when we are 
           * in INTERSECT mode.  It returns either the first object that the 
           * cursor is over, or the object that has the greatest overlap with 
           * the dragged element.
           * @method getBestMatch
           * @param  {DragDrop[]} dds The array of drag and drop objects 
           * targeted
           * @return {DragDrop}       The best single match
           * @static
           */
          getBestMatch: function(dds) {
              var winner = null;
  
              var len = dds.length;
  
              if (len == 1) {
                  winner = dds[0];
              } else {
                  // Loop through the targeted items
                  for (var i=0; i<len; ++i) {
                      var dd = dds[i];
                      // If the cursor is over the object, it wins.  If the 
                      // cursor is over multiple matches, the first one we come
                      // to wins.
                      if (this.mode == this.INTERSECT && dd.cursorIsOver) {
                          winner = dd;
                          break;
                      // Otherwise the object with the most overlap wins
                      } else {
                          if (!winner || !winner.overlap || (dd.overlap &&
                              winner.overlap.getArea() < dd.overlap.getArea())) {
                              winner = dd;
                          }
                      }
                  }
              }
  
              return winner;
          },
  
          /**
           * Refreshes the cache of the top-left and bottom-right points of the 
           * drag and drop objects in the specified group(s).  This is in the
           * format that is stored in the drag and drop instance, so typical 
           * usage is:
           * <code>
           * YAHOO.util.DragDropMgr.refreshCache(ddinstance.groups);
           * </code>
           * Alternatively:
           * <code>
           * YAHOO.util.DragDropMgr.refreshCache({group1:true, group2:true});
           * </code>
           * @TODO this really should be an indexed array.  Alternatively this
           * method could accept both.
           * @method refreshCache
           * @param {Object} groups an associative array of groups to refresh
           * @static
           */
          refreshCache: function(groups) {
              YAHOO.log("refreshing element location cache", "info", "DragDropMgr");
  
              // refresh everything if group array is not provided
              var g = groups || this.ids;
  
              for (var sGroup in g) {
                  if ("string" != typeof sGroup) {
                      continue;
                  }
                  for (var i in this.ids[sGroup]) {
                      var oDD = this.ids[sGroup][i];
  
                      if (this.isTypeOfDD(oDD)) {
                          var loc = this.getLocation(oDD);
                          if (loc) {
                              this.locationCache[oDD.id] = loc;
                          } else {
                              delete this.locationCache[oDD.id];
  YAHOO.log("Could not get the loc for " + oDD.id, "warn", "DragDropMgr");
                          }
                      }
                  }
              }
          },
  
          /**
           * This checks to make sure an element exists and is in the DOM.  The
           * main purpose is to handle cases where innerHTML is used to remove
           * drag and drop objects from the DOM.  IE provides an 'unspecified
           * error' when trying to access the offsetParent of such an element
           * @method verifyEl
           * @param {HTMLElement} el the element to check
           * @return {boolean} true if the element looks usable
           * @static
           */
          verifyEl: function(el) {
              try {
                  if (el) {
                      var parent = el.offsetParent;
                      if (parent) {
                          return true;
                      }
                  }
              } catch(e) {
                  YAHOO.log("detected problem with an element", "info", "DragDropMgr");
              }
  
              return false;
          },
          
          /**
           * Returns a Region object containing the drag and drop element's position
           * and size, including the padding configured for it
           * @method getLocation
           * @param {DragDrop} oDD the drag and drop object to get the 
           *                       location for
           * @return {YAHOO.util.Region} a Region object representing the total area
           *                             the element occupies, including any padding
           *                             the instance is configured for.
           * @static
           */
          getLocation: function(oDD) {
              if (! this.isTypeOfDD(oDD)) {
                  YAHOO.log(oDD + " is not a DD obj", "info", "DragDropMgr");
                  return null;
              }
  
              var el = oDD.getEl(), pos, x1, x2, y1, y2, t, r, b, l;
  
              try {
                  pos= YAHOO.util.Dom.getXY(el);
              } catch (e) { }
  
              if (!pos) {
                  YAHOO.log("getXY failed", "info", "DragDropMgr");
                  return null;
              }
  
              x1 = pos[0];
              x2 = x1 + el.offsetWidth;
              y1 = pos[1];
              y2 = y1 + el.offsetHeight;
  
              t = y1 - oDD.padding[0];
              r = x2 + oDD.padding[1];
              b = y2 + oDD.padding[2];
              l = x1 - oDD.padding[3];
  
              return new YAHOO.util.Region( t, r, b, l );
          },
  
          /**
           * Checks the cursor location to see if it over the target
           * @method isOverTarget
           * @param {YAHOO.util.Point} pt The point to evaluate
           * @param {DragDrop} oTarget the DragDrop object we are inspecting
           * @param {boolean} intersect true if we are in intersect mode
           * @param {YAHOO.util.Region} pre-cached location of the dragged element
           * @return {boolean} true if the mouse is over the target
           * @private
           * @static
           */
          isOverTarget: function(pt, oTarget, intersect, curRegion) {
              // use cache if available
              var loc = this.locationCache[oTarget.id];
              if (!loc || !this.useCache) {
                  YAHOO.log("cache not populated", "info", "DragDropMgr");
                  loc = this.getLocation(oTarget);
                  this.locationCache[oTarget.id] = loc;
  
                  YAHOO.log("cache: " + loc, "info", "DragDropMgr");
              }
  
              if (!loc) {
                  YAHOO.log("could not get the location of the element", "info", "DragDropMgr");
                  return false;
              }
  
              //YAHOO.log("loc: " + loc + ", pt: " + pt);
              oTarget.cursorIsOver = loc.contains( pt );
  
              // DragDrop is using this as a sanity check for the initial mousedown
              // in this case we are done.  In POINT mode, if the drag obj has no
              // contraints, we are done. Otherwise we need to evaluate the 
              // region the target as occupies to determine if the dragged element
              // overlaps with it.
              
              var dc = this.dragCurrent;
              if (!dc || (!intersect && !dc.constrainX && !dc.constrainY)) {
  
                  //if (oTarget.cursorIsOver) {
                      //YAHOO.log("over " + oTarget + ", " + loc + ", " + pt, "warn");
                  //}
                  return oTarget.cursorIsOver;
              }
  
              oTarget.overlap = null;
  
  
              // Get the current location of the drag element, this is the
              // location of the mouse event less the delta that represents
              // where the original mousedown happened on the element.  We
              // need to consider constraints and ticks as well.
  
              if (!curRegion) {
                  var pos = dc.getTargetCoord(pt.x, pt.y);
                  var el = dc.getDragEl();
                  curRegion = new YAHOO.util.Region( pos.y, 
                                                     pos.x + el.offsetWidth,
                                                     pos.y + el.offsetHeight, 
                                                     pos.x );
              }
  
              var overlap = curRegion.intersect(loc);
  
              if (overlap) {
                  oTarget.overlap = overlap;
                  return (intersect) ? true : oTarget.cursorIsOver;
              } else {
                  return false;
              }
          },
  
          /**
           * unload event handler
           * @method _onUnload
           * @private
           * @static
           */
          _onUnload: function(e, me) {
              this.unregAll();
          },
  
          /**
           * Cleans up the drag and drop events and objects.
           * @method unregAll
           * @private
           * @static
           */
          unregAll: function() {
              YAHOO.log("unregister all", "info", "DragDropMgr");
  
              if (this.dragCurrent) {
                  this.stopDrag();
                  this.dragCurrent = null;
              }
  
              this._execOnAll("unreg", []);
  
              //for (var i in this.elementCache) {
                  //delete this.elementCache[i];
              //}
              //this.elementCache = {};
  
              this.ids = {};
          },
  
          /**
           * A cache of DOM elements
           * @property elementCache
           * @private
           * @static
           * @deprecated elements are not cached now
           */
          elementCache: {},
          
          /**
           * Get the wrapper for the DOM element specified
           * @method getElWrapper
           * @param {String} id the id of the element to get
           * @return {YAHOO.util.DDM.ElementWrapper} the wrapped element
           * @private
           * @deprecated This wrapper isn't that useful
           * @static
           */
          getElWrapper: function(id) {
              var oWrapper = this.elementCache[id];
              if (!oWrapper || !oWrapper.el) {
                  oWrapper = this.elementCache[id] = 
                      new this.ElementWrapper(YAHOO.util.Dom.get(id));
              }
              return oWrapper;
          },
  
          /**
           * Returns the actual DOM element
           * @method getElement
           * @param {String} id the id of the elment to get
           * @return {Object} The element
           * @deprecated use YAHOO.util.Dom.get instead
           * @static
           */
          getElement: function(id) {
              return YAHOO.util.Dom.get(id);
          },
          
          /**
           * Returns the style property for the DOM element (i.e., 
           * document.getElById(id).style)
           * @method getCss
           * @param {String} id the id of the elment to get
           * @return {Object} The style property of the element
           * @deprecated use YAHOO.util.Dom instead
           * @static
           */
          getCss: function(id) {
              var el = YAHOO.util.Dom.get(id);
              return (el) ? el.style : null;
          },
  
          /**
           * Inner class for cached elements
           * @class DragDropMgr.ElementWrapper
           * @for DragDropMgr
           * @private
           * @deprecated
           */
          ElementWrapper: function(el) {
                  /**
                   * The element
                   * @property el
                   */
                  this.el = el || null;
                  /**
                   * The element id
                   * @property id
                   */
                  this.id = this.el && el.id;
                  /**
                   * A reference to the style property
                   * @property css
                   */
                  this.css = this.el && el.style;
              },
  
          /**
           * Returns the X position of an html element
           * @method getPosX
           * @param el the element for which to get the position
           * @return {int} the X coordinate
           * @for DragDropMgr
           * @deprecated use YAHOO.util.Dom.getX instead
           * @static
           */
          getPosX: function(el) {
              return YAHOO.util.Dom.getX(el);
          },
  
          /**
           * Returns the Y position of an html element
           * @method getPosY
           * @param el the element for which to get the position
           * @return {int} the Y coordinate
           * @deprecated use YAHOO.util.Dom.getY instead
           * @static
           */
          getPosY: function(el) {
              return YAHOO.util.Dom.getY(el); 
          },
  
          /**
           * Swap two nodes.  In IE, we use the native method, for others we 
           * emulate the IE behavior
           * @method swapNode
           * @param n1 the first node to swap
           * @param n2 the other node to swap
           * @static
           */
          swapNode: function(n1, n2) {
              if (n1.swapNode) {
                  n1.swapNode(n2);
              } else {
                  var p = n2.parentNode;
                  var s = n2.nextSibling;
  
                  if (s == n1) {
                      p.insertBefore(n1, n2);
                  } else if (n2 == n1.nextSibling) {
                      p.insertBefore(n2, n1);
                  } else {
                      n1.parentNode.replaceChild(n2, n1);
                      p.insertBefore(n1, s);
                  }
              }
          },
  
          /**
           * Returns the current scroll position
           * @method getScroll
           * @private
           * @static
           */
          getScroll: function () {
              var t, l, dde=document.documentElement, db=document.body;
              if (dde && (dde.scrollTop || dde.scrollLeft)) {
                  t = dde.scrollTop;
                  l = dde.scrollLeft;
              } else if (db) {
                  t = db.scrollTop;
                  l = db.scrollLeft;
              } else {
                  YAHOO.log("could not get scroll property", "info", "DragDropMgr");
              }
              return { top: t, left: l };
          },
  
          /**
           * Returns the specified element style property
           * @method getStyle
           * @param {HTMLElement} el          the element
           * @param {string}      styleProp   the style property
           * @return {string} The value of the style property
           * @deprecated use YAHOO.util.Dom.getStyle
           * @static
           */
          getStyle: function(el, styleProp) {
              return YAHOO.util.Dom.getStyle(el, styleProp);
          },
  
          /**
           * Gets the scrollTop
           * @method getScrollTop
           * @return {int} the document's scrollTop
           * @static
           */
          getScrollTop: function () { return this.getScroll().top; },
  
          /**
           * Gets the scrollLeft
           * @method getScrollLeft
           * @return {int} the document's scrollTop
           * @static
           */
          getScrollLeft: function () { return this.getScroll().left; },
  
          /**
           * Sets the x/y position of an element to the location of the
           * target element.
           * @method moveToEl
           * @param {HTMLElement} moveEl      The element to move
           * @param {HTMLElement} targetEl    The position reference element
           * @static
           */
          moveToEl: function (moveEl, targetEl) {
              var aCoord = YAHOO.util.Dom.getXY(targetEl);
              YAHOO.log("moveToEl: " + aCoord, "info", "DragDropMgr");
              YAHOO.util.Dom.setXY(moveEl, aCoord);
          },
  
          /**
           * Gets the client height
           * @method getClientHeight
           * @return {int} client height in px
           * @deprecated use YAHOO.util.Dom.getViewportHeight instead
           * @static
           */
          getClientHeight: function() {
              return YAHOO.util.Dom.getViewportHeight();
          },
  
          /**
           * Gets the client width
           * @method getClientWidth
           * @return {int} client width in px
           * @deprecated use YAHOO.util.Dom.getViewportWidth instead
           * @static
           */
          getClientWidth: function() {
              return YAHOO.util.Dom.getViewportWidth();
          },
  
          /**
           * Numeric array sort function
           * @method numericSort
           * @static
           */
          numericSort: function(a, b) { return (a - b); },
  
          /**
           * Internal counter
           * @property _timeoutCount
           * @private
           * @static
           */
          _timeoutCount: 0,
  
          /**
           * Trying to make the load order less important.  Without this we get
           * an error if this file is loaded before the Event Utility.
           * @method _addListeners
           * @private
           * @static
           */
          _addListeners: function() {
              var DDM = YAHOO.util.DDM;
              if ( YAHOO.util.Event && document ) {
                  DDM._onLoad();
              } else {
                  if (DDM._timeoutCount > 2000) {
                      YAHOO.log("DragDrop requires the Event Utility", "error", "DragDropMgr");
                  } else {
                      setTimeout(DDM._addListeners, 10);
                      if (document && document.body) {
                          DDM._timeoutCount += 1;
                      }
                  }
              }
          },
  
          /**
           * Recursively searches the immediate parent and all child nodes for 
           * the handle element in order to determine wheter or not it was 
           * clicked.
           * @method handleWasClicked
           * @param node the html element to inspect
           * @static
           */
          handleWasClicked: function(node, id) {
              if (this.isHandle(id, node.id)) {
                  YAHOO.log("clicked node is a handle", "info", "DragDropMgr");
                  return true;
              } else {
                  // check to see if this is a text node child of the one we want
                  var p = node.parentNode;
                  // YAHOO.log("p: " + p);
  
                  while (p) {
                      if (this.isHandle(id, p.id)) {
                          return true;
                      } else {
                          YAHOO.log(p.id + " is not a handle", "info", "DragDropMgr");
                          p = p.parentNode;
                      }
                  }
              }
  
              return false;
          }
  
      };
  
  }();
  
  // shorter alias, save a few bytes
  YAHOO.util.DDM = YAHOO.util.DragDropMgr;
  YAHOO.util.DDM._addListeners();
  
  }
  
  (function() {
  
  var Event=YAHOO.util.Event; 
  var Dom=YAHOO.util.Dom;
  
  /**
   * Defines the interface and base operation of items that that can be 
   * dragged or can be drop targets.  It was designed to be extended, overriding
   * the event handlers for startDrag, onDrag, onDragOver, onDragOut.
   * Up to three html elements can be associated with a DragDrop instance:
   * <ul>
   * <li>linked element: the element that is passed into the constructor.
   * This is the element which defines the boundaries for interaction with 
   * other DragDrop objects.</li>
   * <li>handle element(s): The drag operation only occurs if the element that 
   * was clicked matches a handle element.  By default this is the linked 
   * element, but there are times that you will want only a portion of the 
   * linked element to initiate the drag operation, and the setHandleElId() 
   * method provides a way to define this.</li>
   * <li>drag element: this represents an the element that would be moved along
   * with the cursor during a drag operation.  By default, this is the linked
   * element itself as in {@link YAHOO.util.DD}.  setDragElId() lets you define
   * a separate element that would be moved, as in {@link YAHOO.util.DDProxy}
   * </li>
   * </ul>
   * This class should not be instantiated until the onload event to ensure that
   * the associated elements are available.
   * The following would define a DragDrop obj that would interact with any 
   * other DragDrop obj in the "group1" group:
   * <pre>
   *  dd = new YAHOO.util.DragDrop("div1", "group1");
   * </pre>
   * Since none of the event handlers have been implemented, nothing would 
   * actually happen if you were to run the code above.  Normally you would 
   * override this class or one of the default implementations, but you can 
   * also override the methods you want on an instance of the class...
   * <pre>
   *  dd.onDragDrop = function(e, id) {
   *  &nbsp;&nbsp;alert("dd was dropped on " + id);
   *  }
   * </pre>
   * @namespace YAHOO.util
   * @class DragDrop
   * @constructor
   * @param {String} id of the element that is linked to this instance
   * @param {String} sGroup the group of related DragDrop objects
   * @param {object} config an object containing configurable attributes
   *                Valid properties for DragDrop: 
   *                    padding, isTarget, maintainOffset, primaryButtonOnly,
   */
  YAHOO.util.DragDrop = function(id, sGroup, config) {
      if (id) {
          this.init(id, sGroup, config); 
      }
  };
  
  YAHOO.util.DragDrop.prototype = {
      /**
       * An Object Literal containing the events that we will be using: mouseDown, b4MouseDown, mouseUp, b4StartDrag, startDrag, b4EndDrag, endDrag, mouseUp, drag, b4Drag, invalidDrop, b4DragOut, dragOut, dragEnter, b4DragOver, dragOver, b4DragDrop, dragDrop
       * By setting any of these to false, then event will not be fired.
       * @property events
       * @type object
       */
      events: null,
      /**
      * @method on
      * @description Shortcut for EventProvider.subscribe, see <a href="YAHOO.util.EventProvider.html#subscribe">YAHOO.util.EventProvider.subscribe</a>
      */
      on: function() {
          this.subscribe.apply(this, arguments);
      },
      /**
       * The id of the element associated with this object.  This is what we 
       * refer to as the "linked element" because the size and position of 
       * this element is used to determine when the drag and drop objects have 
       * interacted.
       * @property id
       * @type String
       */
      id: null,
  
      /**
       * Configuration attributes passed into the constructor
       * @property config
       * @type object
       */
      config: null,
  
      /**
       * The id of the element that will be dragged.  By default this is same 
       * as the linked element , but could be changed to another element. Ex: 
       * YAHOO.util.DDProxy
       * @property dragElId
       * @type String
       * @private
       */
      dragElId: null, 
  
      /**
       * the id of the element that initiates the drag operation.  By default 
       * this is the linked element, but could be changed to be a child of this
       * element.  This lets us do things like only starting the drag when the 
       * header element within the linked html element is clicked.
       * @property handleElId
       * @type String
       * @private
       */
      handleElId: null, 
  
      /**
       * An associative array of HTML tags that will be ignored if clicked.
       * @property invalidHandleTypes
       * @type {string: string}
       */
      invalidHandleTypes: null, 
  
      /**
       * An associative array of ids for elements that will be ignored if clicked
       * @property invalidHandleIds
       * @type {string: string}
       */
      invalidHandleIds: null, 
  
      /**
       * An indexted array of css class names for elements that will be ignored
       * if clicked.
       * @property invalidHandleClasses
       * @type string[]
       */
      invalidHandleClasses: null, 
  
      /**
       * The linked element's absolute X position at the time the drag was 
       * started
       * @property startPageX
       * @type int
       * @private
       */
      startPageX: 0,
  
      /**
       * The linked element's absolute X position at the time the drag was 
       * started
       * @property startPageY
       * @type int
       * @private
       */
      startPageY: 0,
  
      /**
       * The group defines a logical collection of DragDrop objects that are 
       * related.  Instances only get events when interacting with other 
       * DragDrop object in the same group.  This lets us define multiple 
       * groups using a single DragDrop subclass if we want.
       * @property groups
       * @type {string: string}
       */
      groups: null,
  
      /**
       * Individual drag/drop instances can be locked.  This will prevent 
       * onmousedown start drag.
       * @property locked
       * @type boolean
       * @private
       */
      locked: false,
  
      /**
       * Lock this instance
       * @method lock
       */
      lock: function() { this.locked = true; },
  
      /**
       * Unlock this instace
       * @method unlock
       */
      unlock: function() { this.locked = false; },
  
      /**
       * By default, all instances can be a drop target.  This can be disabled by
       * setting isTarget to false.
       * @property isTarget
       * @type boolean
       */
      isTarget: true,
  
      /**
       * The padding configured for this drag and drop object for calculating
       * the drop zone intersection with this object.
       * @property padding
       * @type int[]
       */
      padding: null,
      /**
       * If this flag is true, do not fire drop events. The element is a drag only element (for movement not dropping)
       * @property dragOnly
       * @type Boolean
       */
      dragOnly: false,
  
      /**
       * If this flag is true, a shim will be placed over the screen/viewable area to track mouse events. Should help with dragging elements over iframes and other controls.
       * @property useShim
       * @type Boolean
       */
      useShim: false,
  
      /**
       * Cached reference to the linked element
       * @property _domRef
       * @private
       */
      _domRef: null,
  
      /**
       * Internal typeof flag
       * @property __ygDragDrop
       * @private
       */
      __ygDragDrop: true,
  
      /**
       * Set to true when horizontal contraints are applied
       * @property constrainX
       * @type boolean
       * @private
       */
      constrainX: false,
  
      /**
       * Set to true when vertical contraints are applied
       * @property constrainY
       * @type boolean
       * @private
       */
      constrainY: false,
  
      /**
       * The left constraint
       * @property minX
       * @type int
       * @private
       */
      minX: 0,
  
      /**
       * The right constraint
       * @property maxX
       * @type int
       * @private
       */
      maxX: 0,
  
      /**
       * The up constraint 
       * @property minY
       * @type int
       * @type int
       * @private
       */
      minY: 0,
  
      /**
       * The down constraint 
       * @property maxY
       * @type int
       * @private
       */
      maxY: 0,
  
      /**
       * The difference between the click position and the source element's location
       * @property deltaX
       * @type int
       * @private
       */
      deltaX: 0,
  
      /**
       * The difference between the click position and the source element's location
       * @property deltaY
       * @type int
       * @private
       */
      deltaY: 0,
  
      /**
       * Maintain offsets when we resetconstraints.  Set to true when you want
       * the position of the element relative to its parent to stay the same
       * when the page changes
       *
       * @property maintainOffset
       * @type boolean
       */
      maintainOffset: false,
  
      /**
       * Array of pixel locations the element will snap to if we specified a 
       * horizontal graduation/interval.  This array is generated automatically
       * when you define a tick interval.
       * @property xTicks
       * @type int[]
       */
      xTicks: null,
  
      /**
       * Array of pixel locations the element will snap to if we specified a 
       * vertical graduation/interval.  This array is generated automatically 
       * when you define a tick interval.
       * @property yTicks
       * @type int[]
       */
      yTicks: null,
  
      /**
       * By default the drag and drop instance will only respond to the primary
       * button click (left button for a right-handed mouse).  Set to true to
       * allow drag and drop to start with any mouse click that is propogated
       * by the browser
       * @property primaryButtonOnly
       * @type boolean
       */
      primaryButtonOnly: true,
  
      /**
       * The availabe property is false until the linked dom element is accessible.
       * @property available
       * @type boolean
       */
      available: false,
  
      /**
       * By default, drags can only be initiated if the mousedown occurs in the
       * region the linked element is.  This is done in part to work around a
       * bug in some browsers that mis-report the mousedown if the previous
       * mouseup happened outside of the window.  This property is set to true
       * if outer handles are defined.
       *
       * @property hasOuterHandles
       * @type boolean
       * @default false
       */
      hasOuterHandles: false,
  
      /**
       * Property that is assigned to a drag and drop object when testing to
       * see if it is being targeted by another dd object.  This property
       * can be used in intersect mode to help determine the focus of
       * the mouse interaction.  DDM.getBestMatch uses this property first to
       * determine the closest match in INTERSECT mode when multiple targets
       * are part of the same interaction.
       * @property cursorIsOver
       * @type boolean
       */
      cursorIsOver: false,
  
      /**
       * Property that is assigned to a drag and drop object when testing to
       * see if it is being targeted by another dd object.  This is a region
       * that represents the area the draggable element overlaps this target.
       * DDM.getBestMatch uses this property to compare the size of the overlap
       * to that of other targets in order to determine the closest match in
       * INTERSECT mode when multiple targets are part of the same interaction.
       * @property overlap 
       * @type YAHOO.util.Region
       */
      overlap: null,
  
      /**
       * Code that executes immediately before the startDrag event
       * @method b4StartDrag
       * @private
       */
      b4StartDrag: function(x, y) { },
  
      /**
       * Abstract method called after a drag/drop object is clicked
       * and the drag or mousedown time thresholds have beeen met.
       * @method startDrag
       * @param {int} X click location
       * @param {int} Y click location
       */
      startDrag: function(x, y) { /* override this */ },
  
      /**
       * Code that executes immediately before the onDrag event
       * @method b4Drag
       * @private
       */
      b4Drag: function(e) { },
  
      /**
       * Abstract method called during the onMouseMove event while dragging an 
       * object.
       * @method onDrag
       * @param {Event} e the mousemove event
       */
      onDrag: function(e) { /* override this */ },
  
      /**
       * Abstract method called when this element fist begins hovering over 
       * another DragDrop obj
       * @method onDragEnter
       * @param {Event} e the mousemove event
       * @param {String|DragDrop[]} id In POINT mode, the element
       * id this is hovering over.  In INTERSECT mode, an array of one or more 
       * dragdrop items being hovered over.
       */
      onDragEnter: function(e, id) { /* override this */ },
  
      /**
       * Code that executes immediately before the onDragOver event
       * @method b4DragOver
       * @private
       */
      b4DragOver: function(e) { },
  
      /**
       * Abstract method called when this element is hovering over another 
       * DragDrop obj
       * @method onDragOver
       * @param {Event} e the mousemove event
       * @param {String|DragDrop[]} id In POINT mode, the element
       * id this is hovering over.  In INTERSECT mode, an array of dd items 
       * being hovered over.
       */
      onDragOver: function(e, id) { /* override this */ },
  
      /**
       * Code that executes immediately before the onDragOut event
       * @method b4DragOut
       * @private
       */
      b4DragOut: function(e) { },
  
      /**
       * Abstract method called when we are no longer hovering over an element
       * @method onDragOut
       * @param {Event} e the mousemove event
       * @param {String|DragDrop[]} id In POINT mode, the element
       * id this was hovering over.  In INTERSECT mode, an array of dd items 
       * that the mouse is no longer over.
       */
      onDragOut: function(e, id) { /* override this */ },
  
      /**
       * Code that executes immediately before the onDragDrop event
       * @method b4DragDrop
       * @private
       */
      b4DragDrop: function(e) { },
  
      /**
       * Abstract method called when this item is dropped on another DragDrop 
       * obj
       * @method onDragDrop
       * @param {Event} e the mouseup event
       * @param {String|DragDrop[]} id In POINT mode, the element
       * id this was dropped on.  In INTERSECT mode, an array of dd items this 
       * was dropped on.
       */
      onDragDrop: function(e, id) { /* override this */ },
  
      /**
       * Abstract method called when this item is dropped on an area with no
       * drop target
       * @method onInvalidDrop
       * @param {Event} e the mouseup event
       */
      onInvalidDrop: function(e) { /* override this */ },
  
      /**
       * Code that executes immediately before the endDrag event
       * @method b4EndDrag
       * @private
       */
      b4EndDrag: function(e) { },
  
      /**
       * Fired when we are done dragging the object
       * @method endDrag
       * @param {Event} e the mouseup event
       */
      endDrag: function(e) { /* override this */ },
  
      /**
       * Code executed immediately before the onMouseDown event
       * @method b4MouseDown
       * @param {Event} e the mousedown event
       * @private
       */
      b4MouseDown: function(e) {  },
  
      /**
       * Event handler that fires when a drag/drop obj gets a mousedown
       * @method onMouseDown
       * @param {Event} e the mousedown event
       */
      onMouseDown: function(e) { /* override this */ },
  
      /**
       * Event handler that fires when a drag/drop obj gets a mouseup
       * @method onMouseUp
       * @param {Event} e the mouseup event
       */
      onMouseUp: function(e) { /* override this */ },
     
      /**
       * Override the onAvailable method to do what is needed after the initial
       * position was determined.
       * @method onAvailable
       */
      onAvailable: function () { 
          //this.logger.log("onAvailable (base)"); 
      },
  
      /**
       * Returns a reference to the linked element
       * @method getEl
       * @return {HTMLElement} the html element 
       */
      getEl: function() { 
          if (!this._domRef) {
              this._domRef = Dom.get(this.id); 
          }
  
          return this._domRef;
      },
  
      /**
       * Returns a reference to the actual element to drag.  By default this is
       * the same as the html element, but it can be assigned to another 
       * element. An example of this can be found in YAHOO.util.DDProxy
       * @method getDragEl
       * @return {HTMLElement} the html element 
       */
      getDragEl: function() {
          return Dom.get(this.dragElId);
      },
  
      /**
       * Sets up the DragDrop object.  Must be called in the constructor of any
       * YAHOO.util.DragDrop subclass
       * @method init
       * @param id the id of the linked element
       * @param {String} sGroup the group of related items
       * @param {object} config configuration attributes
       */
      init: function(id, sGroup, config) {
          this.initTarget(id, sGroup, config);
          Event.on(this._domRef || this.id, "mousedown", 
                          this.handleMouseDown, this, true);
  
          // Event.on(this.id, "selectstart", Event.preventDefault);
          for (var i in this.events) {
              this.createEvent(i + 'Event');
          }
          
      },
  
      /**
       * Initializes Targeting functionality only... the object does not
       * get a mousedown handler.
       * @method initTarget
       * @param id the id of the linked element
       * @param {String} sGroup the group of related items
       * @param {object} config configuration attributes
       */
      initTarget: function(id, sGroup, config) {
  
          // configuration attributes 
          this.config = config || {};
  
          this.events = {};
  
          // create a local reference to the drag and drop manager
          this.DDM = YAHOO.util.DDM;
  
          // initialize the groups object
          this.groups = {};
  
          // assume that we have an element reference instead of an id if the
          // parameter is not a string
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              this._domRef = id;
              id = Dom.generateId(id);
          }
  
          // set the id
          this.id = id;
  
          // add to an interaction group
          this.addToGroup((sGroup) ? sGroup : "default");
  
          // We don't want to register this as the handle with the manager
          // so we just set the id rather than calling the setter.
          this.handleElId = id;
  
          Event.onAvailable(id, this.handleOnAvailable, this, true);
  
          // create a logger instance
          this.logger = (YAHOO.widget.LogWriter) ? 
                  new YAHOO.widget.LogWriter(this.toString()) : YAHOO;
  
          // the linked element is the element that gets dragged by default
          this.setDragElId(id); 
  
          // by default, clicked anchors will not start drag operations. 
          // @TODO what else should be here?  Probably form fields.
          this.invalidHandleTypes = { A: "A" };
          this.invalidHandleIds = {};
          this.invalidHandleClasses = [];
  
          this.applyConfig();
      },
  
      /**
       * Applies the configuration parameters that were passed into the constructor.
       * This is supposed to happen at each level through the inheritance chain.  So
       * a DDProxy implentation will execute apply config on DDProxy, DD, and 
       * DragDrop in order to get all of the parameters that are available in
       * each object.
       * @method applyConfig
       */
      applyConfig: function() {
          this.events = {
              mouseDown: true,
              b4MouseDown: true,
              mouseUp: true,
              b4StartDrag: true,
              startDrag: true,
              b4EndDrag: true,
              endDrag: true,
              drag: true,
              b4Drag: true,
              invalidDrop: true,
              b4DragOut: true,
              dragOut: true,
              dragEnter: true,
              b4DragOver: true,
              dragOver: true,
              b4DragDrop: true,
              dragDrop: true
          };
          
          if (this.config.events) {
              for (var i in this.config.events) {
                  if (this.config.events[i] === false) {
                      this.events[i] = false;
                  }
              }
          }
  
  
          // configurable properties: 
          //    padding, isTarget, maintainOffset, primaryButtonOnly
          this.padding           = this.config.padding || [0, 0, 0, 0];
          this.isTarget          = (this.config.isTarget !== false);
          this.maintainOffset    = (this.config.maintainOffset);
          this.primaryButtonOnly = (this.config.primaryButtonOnly !== false);
          this.dragOnly = ((this.config.dragOnly === true) ? true : false);
          this.useShim = ((this.config.useShim === true) ? true : false);
      },
  
      /**
       * Executed when the linked element is available
       * @method handleOnAvailable
       * @private
       */
      handleOnAvailable: function() {
          //this.logger.log("handleOnAvailable");
          this.available = true;
          this.resetConstraints();
          this.onAvailable();
      },
  
       /**
       * Configures the padding for the target zone in px.  Effectively expands
       * (or reduces) the virtual object size for targeting calculations.  
       * Supports css-style shorthand; if only one parameter is passed, all sides
       * will have that padding, and if only two are passed, the top and bottom
       * will have the first param, the left and right the second.
       * @method setPadding
       * @param {int} iTop    Top pad
       * @param {int} iRight  Right pad
       * @param {int} iBot    Bot pad
       * @param {int} iLeft   Left pad
       */
      setPadding: function(iTop, iRight, iBot, iLeft) {
          // this.padding = [iLeft, iRight, iTop, iBot];
          if (!iRight && 0 !== iRight) {
              this.padding = [iTop, iTop, iTop, iTop];
          } else if (!iBot && 0 !== iBot) {
              this.padding = [iTop, iRight, iTop, iRight];
          } else {
              this.padding = [iTop, iRight, iBot, iLeft];
          }
      },
  
      /**
       * Stores the initial placement of the linked element.
       * @method setInitialPosition
       * @param {int} diffX   the X offset, default 0
       * @param {int} diffY   the Y offset, default 0
       * @private
       */
      setInitPosition: function(diffX, diffY) {
          var el = this.getEl();
  
          if (!this.DDM.verifyEl(el)) {
              if (el && el.style && (el.style.display == 'none')) {
                  this.logger.log(this.id + " can not get initial position, element style is display: none");
              } else {
                  this.logger.log(this.id + " element is broken");
              }
              return;
          }
  
          var dx = diffX || 0;
          var dy = diffY || 0;
  
          var p = Dom.getXY( el );
  
          this.initPageX = p[0] - dx;
          this.initPageY = p[1] - dy;
  
          this.lastPageX = p[0];
          this.lastPageY = p[1];
  
          this.logger.log(this.id + " initial position: " + this.initPageX + 
                  ", " + this.initPageY);
  
  
          this.setStartPosition(p);
      },
  
      /**
       * Sets the start position of the element.  This is set when the obj
       * is initialized, the reset when a drag is started.
       * @method setStartPosition
       * @param pos current position (from previous lookup)
       * @private
       */
      setStartPosition: function(pos) {
          var p = pos || Dom.getXY(this.getEl());
  
          this.deltaSetXY = null;
  
          this.startPageX = p[0];
          this.startPageY = p[1];
      },
  
      /**
       * Add this instance to a group of related drag/drop objects.  All 
       * instances belong to at least one group, and can belong to as many 
       * groups as needed.
       * @method addToGroup
       * @param sGroup {string} the name of the group
       */
      addToGroup: function(sGroup) {
          this.groups[sGroup] = true;
          this.DDM.regDragDrop(this, sGroup);
      },
  
      /**
       * Remove's this instance from the supplied interaction group
       * @method removeFromGroup
       * @param {string}  sGroup  The group to drop
       */
      removeFromGroup: function(sGroup) {
          this.logger.log("Removing from group: " + sGroup);
          if (this.groups[sGroup]) {
              delete this.groups[sGroup];
          }
  
          this.DDM.removeDDFromGroup(this, sGroup);
      },
  
      /**
       * Allows you to specify that an element other than the linked element 
       * will be moved with the cursor during a drag
       * @method setDragElId
       * @param id {string} the id of the element that will be used to initiate the drag
       */
      setDragElId: function(id) {
          this.dragElId = id;
      },
  
      /**
       * Allows you to specify a child of the linked element that should be 
       * used to initiate the drag operation.  An example of this would be if 
       * you have a content div with text and links.  Clicking anywhere in the 
       * content area would normally start the drag operation.  Use this method
       * to specify that an element inside of the content div is the element 
       * that starts the drag operation.
       * @method setHandleElId
       * @param id {string} the id of the element that will be used to 
       * initiate the drag.
       */
      setHandleElId: function(id) {
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              id = Dom.generateId(id);
          }
          this.handleElId = id;
          this.DDM.regHandle(this.id, id);
      },
  
      /**
       * Allows you to set an element outside of the linked element as a drag 
       * handle
       * @method setOuterHandleElId
       * @param id the id of the element that will be used to initiate the drag
       */
      setOuterHandleElId: function(id) {
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              id = Dom.generateId(id);
          }
          this.logger.log("Adding outer handle event: " + id);
          Event.on(id, "mousedown", 
                  this.handleMouseDown, this, true);
          this.setHandleElId(id);
  
          this.hasOuterHandles = true;
      },
  
      /**
       * Remove all drag and drop hooks for this element
       * @method unreg
       */
      unreg: function() {
          this.logger.log("DragDrop obj cleanup " + this.id);
          Event.removeListener(this.id, "mousedown", 
                  this.handleMouseDown);
          this._domRef = null;
          this.DDM._remove(this);
      },
  
      /**
       * Returns true if this instance is locked, or the drag drop mgr is locked
       * (meaning that all drag/drop is disabled on the page.)
       * @method isLocked
       * @return {boolean} true if this obj or all drag/drop is locked, else 
       * false
       */
      isLocked: function() {
          return (this.DDM.isLocked() || this.locked);
      },
  
      /**
       * Fired when this object is clicked
       * @method handleMouseDown
       * @param {Event} e 
       * @param {YAHOO.util.DragDrop} oDD the clicked dd object (this dd obj)
       * @private
       */
      handleMouseDown: function(e, oDD) {
  
          var button = e.which || e.button;
          this.logger.log("button: " + button);
  
          if (this.primaryButtonOnly && button > 1) {
              this.logger.log("Mousedown was not produced by the primary button");
              return;
          }
  
          if (this.isLocked()) {
              this.logger.log("Drag and drop is disabled, aborting");
              return;
          }
  
          this.logger.log("mousedown " + this.id);
  
          this.logger.log("firing onMouseDown events");
  
          // firing the mousedown events prior to calculating positions
          var b4Return = this.b4MouseDown(e),
          b4Return2 = true;
  
          if (this.events.b4MouseDown) {
              b4Return2 = this.fireEvent('b4MouseDownEvent', e);
          }
          var mDownReturn = this.onMouseDown(e),
              mDownReturn2 = true;
          if (this.events.mouseDown) {
              mDownReturn2 = this.fireEvent('mouseDownEvent', e);
          }
  
          if ((b4Return === false) || (mDownReturn === false) || (b4Return2 === false) || (mDownReturn2 === false)) {
              this.logger.log('b4MouseDown or onMouseDown returned false, exiting drag');
              return;
          }
  
          this.DDM.refreshCache(this.groups);
          // var self = this;
          // setTimeout( function() { self.DDM.refreshCache(self.groups); }, 0);
  
          // Only process the event if we really clicked within the linked 
          // element.  The reason we make this check is that in the case that 
          // another element was moved between the clicked element and the 
          // cursor in the time between the mousedown and mouseup events. When 
          // this happens, the element gets the next mousedown event 
          // regardless of where on the screen it happened.  
          var pt = new YAHOO.util.Point(Event.getPageX(e), Event.getPageY(e));
          if (!this.hasOuterHandles && !this.DDM.isOverTarget(pt, this) )  {
                  this.logger.log("Click was not over the element: " + this.id);
          } else {
              if (this.clickValidator(e)) {
  
                  this.logger.log("click was a valid handle");
  
                  // set the initial element position
                  this.setStartPosition();
  
                  // start tracking mousemove distance and mousedown time to
                  // determine when to start the actual drag
                  this.DDM.handleMouseDown(e, this);
  
                  // this mousedown is mine
                  this.DDM.stopEvent(e);
              } else {
  
  this.logger.log("clickValidator returned false, drag not initiated");
  
              }
          }
      },
  
      /**
       * @method clickValidator
       * @description Method validates that the clicked element
       * was indeed the handle or a valid child of the handle
       * @param {Event} e 
       */
      clickValidator: function(e) {
          var target = YAHOO.util.Event.getTarget(e);
          return ( this.isValidHandleChild(target) &&
                      (this.id == this.handleElId || 
                          this.DDM.handleWasClicked(target, this.id)) );
      },
  
      /**
       * Finds the location the element should be placed if we want to move
       * it to where the mouse location less the click offset would place us.
       * @method getTargetCoord
       * @param {int} iPageX the X coordinate of the click
       * @param {int} iPageY the Y coordinate of the click
       * @return an object that contains the coordinates (Object.x and Object.y)
       * @private
       */
      getTargetCoord: function(iPageX, iPageY) {
  
          // this.logger.log("getTargetCoord: " + iPageX + ", " + iPageY);
  
          var x = iPageX - this.deltaX;
          var y = iPageY - this.deltaY;
  
          if (this.constrainX) {
              if (x < this.minX) { x = this.minX; }
              if (x > this.maxX) { x = this.maxX; }
          }
  
          if (this.constrainY) {
              if (y < this.minY) { y = this.minY; }
              if (y > this.maxY) { y = this.maxY; }
          }
  
          x = this.getTick(x, this.xTicks);
          y = this.getTick(y, this.yTicks);
  
          // this.logger.log("getTargetCoord " + 
                  // " iPageX: " + iPageX +
                  // " iPageY: " + iPageY +
                  // " x: " + x + ", y: " + y);
  
          return {x:x, y:y};
      },
  
      /**
       * Allows you to specify a tag name that should not start a drag operation
       * when clicked.  This is designed to facilitate embedding links within a
       * drag handle that do something other than start the drag.
       * @method addInvalidHandleType
       * @param {string} tagName the type of element to exclude
       */
      addInvalidHandleType: function(tagName) {
          var type = tagName.toUpperCase();
          this.invalidHandleTypes[type] = type;
      },
  
      /**
       * Lets you to specify an element id for a child of a drag handle
       * that should not initiate a drag
       * @method addInvalidHandleId
       * @param {string} id the element id of the element you wish to ignore
       */
      addInvalidHandleId: function(id) {
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              id = Dom.generateId(id);
          }
          this.invalidHandleIds[id] = id;
      },
  
  
      /**
       * Lets you specify a css class of elements that will not initiate a drag
       * @method addInvalidHandleClass
       * @param {string} cssClass the class of the elements you wish to ignore
       */
      addInvalidHandleClass: function(cssClass) {
          this.invalidHandleClasses.push(cssClass);
      },
  
      /**
       * Unsets an excluded tag name set by addInvalidHandleType
       * @method removeInvalidHandleType
       * @param {string} tagName the type of element to unexclude
       */
      removeInvalidHandleType: function(tagName) {
          var type = tagName.toUpperCase();
          // this.invalidHandleTypes[type] = null;
          delete this.invalidHandleTypes[type];
      },
      
      /**
       * Unsets an invalid handle id
       * @method removeInvalidHandleId
       * @param {string} id the id of the element to re-enable
       */
      removeInvalidHandleId: function(id) {
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              id = Dom.generateId(id);
          }
          delete this.invalidHandleIds[id];
      },
  
      /**
       * Unsets an invalid css class
       * @method removeInvalidHandleClass
       * @param {string} cssClass the class of the element(s) you wish to 
       * re-enable
       */
      removeInvalidHandleClass: function(cssClass) {
          for (var i=0, len=this.invalidHandleClasses.length; i<len; ++i) {
              if (this.invalidHandleClasses[i] == cssClass) {
                  delete this.invalidHandleClasses[i];
              }
          }
      },
  
      /**
       * Checks the tag exclusion list to see if this click should be ignored
       * @method isValidHandleChild
       * @param {HTMLElement} node the HTMLElement to evaluate
       * @return {boolean} true if this is a valid tag type, false if not
       */
      isValidHandleChild: function(node) {
  
          var valid = true;
          // var n = (node.nodeName == "#text") ? node.parentNode : node;
          var nodeName;
          try {
              nodeName = node.nodeName.toUpperCase();
          } catch(e) {
              nodeName = node.nodeName;
          }
          valid = valid && !this.invalidHandleTypes[nodeName];
          valid = valid && !this.invalidHandleIds[node.id];
  
          for (var i=0, len=this.invalidHandleClasses.length; valid && i<len; ++i) {
              valid = !Dom.hasClass(node, this.invalidHandleClasses[i]);
          }
  
          this.logger.log("Valid handle? ... " + valid);
  
          return valid;
  
      },
  
      /**
       * Create the array of horizontal tick marks if an interval was specified
       * in setXConstraint().
       * @method setXTicks
       * @private
       */
      setXTicks: function(iStartX, iTickSize) {
          this.xTicks = [];
          this.xTickSize = iTickSize;
          
          var tickMap = {};
  
          for (var i = this.initPageX; i >= this.minX; i = i - iTickSize) {
              if (!tickMap[i]) {
                  this.xTicks[this.xTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          for (i = this.initPageX; i <= this.maxX; i = i + iTickSize) {
              if (!tickMap[i]) {
                  this.xTicks[this.xTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          this.xTicks.sort(this.DDM.numericSort) ;
          this.logger.log("xTicks: " + this.xTicks.join());
      },
  
      /**
       * Create the array of vertical tick marks if an interval was specified in 
       * setYConstraint().
       * @method setYTicks
       * @private
       */
      setYTicks: function(iStartY, iTickSize) {
          // this.logger.log("setYTicks: " + iStartY + ", " + iTickSize
                 // + ", " + this.initPageY + ", " + this.minY + ", " + this.maxY );
          this.yTicks = [];
          this.yTickSize = iTickSize;
  
          var tickMap = {};
  
          for (var i = this.initPageY; i >= this.minY; i = i - iTickSize) {
              if (!tickMap[i]) {
                  this.yTicks[this.yTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          for (i = this.initPageY; i <= this.maxY; i = i + iTickSize) {
              if (!tickMap[i]) {
                  this.yTicks[this.yTicks.length] = i;
                  tickMap[i] = true;
              }
          }
  
          this.yTicks.sort(this.DDM.numericSort) ;
          this.logger.log("yTicks: " + this.yTicks.join());
      },
  
      /**
       * By default, the element can be dragged any place on the screen.  Use 
       * this method to limit the horizontal travel of the element.  Pass in 
       * 0,0 for the parameters if you want to lock the drag to the y axis.
       * @method setXConstraint
       * @param {int} iLeft the number of pixels the element can move to the left
       * @param {int} iRight the number of pixels the element can move to the 
       * right
       * @param {int} iTickSize optional parameter for specifying that the 
       * element
       * should move iTickSize pixels at a time.
       */
      setXConstraint: function(iLeft, iRight, iTickSize) {
          this.leftConstraint = parseInt(iLeft, 10);
          this.rightConstraint = parseInt(iRight, 10);
  
          this.minX = this.initPageX - this.leftConstraint;
          this.maxX = this.initPageX + this.rightConstraint;
          if (iTickSize) { this.setXTicks(this.initPageX, iTickSize); }
  
          this.constrainX = true;
          this.logger.log("initPageX:" + this.initPageX + " minX:" + this.minX + 
                  " maxX:" + this.maxX);
      },
  
      /**
       * Clears any constraints applied to this instance.  Also clears ticks
       * since they can't exist independent of a constraint at this time.
       * @method clearConstraints
       */
      clearConstraints: function() {
          this.logger.log("Clearing constraints");
          this.constrainX = false;
          this.constrainY = false;
          this.clearTicks();
      },
  
      /**
       * Clears any tick interval defined for this instance
       * @method clearTicks
       */
      clearTicks: function() {
          this.logger.log("Clearing ticks");
          this.xTicks = null;
          this.yTicks = null;
          this.xTickSize = 0;
          this.yTickSize = 0;
      },
  
      /**
       * By default, the element can be dragged any place on the screen.  Set 
       * this to limit the vertical travel of the element.  Pass in 0,0 for the
       * parameters if you want to lock the drag to the x axis.
       * @method setYConstraint
       * @param {int} iUp the number of pixels the element can move up
       * @param {int} iDown the number of pixels the element can move down
       * @param {int} iTickSize optional parameter for specifying that the 
       * element should move iTickSize pixels at a time.
       */
      setYConstraint: function(iUp, iDown, iTickSize) {
          this.logger.log("setYConstraint: " + iUp + "," + iDown + "," + iTickSize);
          this.topConstraint = parseInt(iUp, 10);
          this.bottomConstraint = parseInt(iDown, 10);
  
          this.minY = this.initPageY - this.topConstraint;
          this.maxY = this.initPageY + this.bottomConstraint;
          if (iTickSize) { this.setYTicks(this.initPageY, iTickSize); }
  
          this.constrainY = true;
          
          this.logger.log("initPageY:" + this.initPageY + " minY:" + this.minY + 
                  " maxY:" + this.maxY);
      },
  
      /**
       * resetConstraints must be called if you manually reposition a dd element.
       * @method resetConstraints
       */
      resetConstraints: function() {
  
          //this.logger.log("resetConstraints");
  
          // Maintain offsets if necessary
          if (this.initPageX || this.initPageX === 0) {
              //this.logger.log("init pagexy: " + this.initPageX + ", " + 
                                 //this.initPageY);
              //this.logger.log("last pagexy: " + this.lastPageX + ", " + 
                                 //this.lastPageY);
              // figure out how much this thing has moved
              var dx = (this.maintainOffset) ? this.lastPageX - this.initPageX : 0;
              var dy = (this.maintainOffset) ? this.lastPageY - this.initPageY : 0;
  
              this.setInitPosition(dx, dy);
  
          // This is the first time we have detected the element's position
          } else {
              this.setInitPosition();
          }
  
          if (this.constrainX) {
              this.setXConstraint( this.leftConstraint, 
                                   this.rightConstraint, 
                                   this.xTickSize        );
          }
  
          if (this.constrainY) {
              this.setYConstraint( this.topConstraint, 
                                   this.bottomConstraint, 
                                   this.yTickSize         );
          }
      },
  
      /**
       * Normally the drag element is moved pixel by pixel, but we can specify 
       * that it move a number of pixels at a time.  This method resolves the 
       * location when we have it set up like this.
       * @method getTick
       * @param {int} val where we want to place the object
       * @param {int[]} tickArray sorted array of valid points
       * @return {int} the closest tick
       * @private
       */
      getTick: function(val, tickArray) {
  
          if (!tickArray) {
              // If tick interval is not defined, it is effectively 1 pixel, 
              // so we return the value passed to us.
              return val; 
          } else if (tickArray[0] >= val) {
              // The value is lower than the first tick, so we return the first
              // tick.
              return tickArray[0];
          } else {
              for (var i=0, len=tickArray.length; i<len; ++i) {
                  var next = i + 1;
                  if (tickArray[next] && tickArray[next] >= val) {
                      var diff1 = val - tickArray[i];
                      var diff2 = tickArray[next] - val;
                      return (diff2 > diff1) ? tickArray[i] : tickArray[next];
                  }
              }
  
              // The value is larger than the last tick, so we return the last
              // tick.
              return tickArray[tickArray.length - 1];
          }
      },
  
      /**
       * toString method
       * @method toString
       * @return {string} string representation of the dd obj
       */
      toString: function() {
          return ("DragDrop " + this.id);
      }
  
  };
  YAHOO.augment(YAHOO.util.DragDrop, YAHOO.util.EventProvider);
  
  /**
  * @event mouseDownEvent
  * @description Provides access to the mousedown event. The mousedown does not always result in a drag operation.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4MouseDownEvent
  * @description Provides access to the mousedown event, before the mouseDownEvent gets fired. Returning false will cancel the drag.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event mouseUpEvent
  * @description Fired from inside DragDropMgr when the drag operation is finished.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4StartDragEvent
  * @description Fires before the startDragEvent, returning false will cancel the startDrag Event.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event startDragEvent
  * @description Occurs after a mouse down and the drag threshold has been met. The drag threshold default is either 3 pixels of mouse movement or 1 full second of holding the mousedown. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4EndDragEvent
  * @description Fires before the endDragEvent. Returning false will cancel.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event endDragEvent
  * @description Fires on the mouseup event after a drag has been initiated (startDrag fired).
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event dragEvent
  * @description Occurs every mousemove event while dragging.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragEvent
  * @description Fires before the dragEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event invalidDropEvent
  * @description Fires when the dragged objects is dropped in a location that contains no drop targets.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOutEvent
  * @description Fires before the dragOutEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOutEvent
  * @description Fires when a dragged object is no longer over an object that had the onDragEnter fire. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragEnterEvent
  * @description Occurs when the dragged object first interacts with another targettable drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOverEvent
  * @description Fires before the dragOverEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOverEvent
  * @description Fires every mousemove event while over a drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragDropEvent 
  * @description Fires before the dragDropEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragDropEvent
  * @description Fires when the dragged objects is dropped on another.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  })();
  /**
   * A DragDrop implementation where the linked element follows the 
   * mouse cursor during a drag.
   * @class DD
   * @extends YAHOO.util.DragDrop
   * @constructor
   * @param {String} id the id of the linked element 
   * @param {String} sGroup the group of related DragDrop items
   * @param {object} config an object containing configurable attributes
   *                Valid properties for DD: 
   *                    scroll
   */
  YAHOO.util.DD = function(id, sGroup, config) {
      if (id) {
          this.init(id, sGroup, config);
      }
  };
  
  YAHOO.extend(YAHOO.util.DD, YAHOO.util.DragDrop, {
  
      /**
       * When set to true, the utility automatically tries to scroll the browser
       * window when a drag and drop element is dragged near the viewport boundary.
       * Defaults to true.
       * @property scroll
       * @type boolean
       */
      scroll: true, 
  
      /**
       * Sets the pointer offset to the distance between the linked element's top 
       * left corner and the location the element was clicked
       * @method autoOffset
       * @param {int} iPageX the X coordinate of the click
       * @param {int} iPageY the Y coordinate of the click
       */
      autoOffset: function(iPageX, iPageY) {
          var x = iPageX - this.startPageX;
          var y = iPageY - this.startPageY;
          this.setDelta(x, y);
          // this.logger.log("autoOffset el pos: " + aCoord + ", delta: " + x + "," + y);
      },
  
      /** 
       * Sets the pointer offset.  You can call this directly to force the 
       * offset to be in a particular location (e.g., pass in 0,0 to set it 
       * to the center of the object, as done in YAHOO.widget.Slider)
       * @method setDelta
       * @param {int} iDeltaX the distance from the left
       * @param {int} iDeltaY the distance from the top
       */
      setDelta: function(iDeltaX, iDeltaY) {
          this.deltaX = iDeltaX;
          this.deltaY = iDeltaY;
          this.logger.log("deltaX:" + this.deltaX + ", deltaY:" + this.deltaY);
      },
  
      /**
       * Sets the drag element to the location of the mousedown or click event, 
       * maintaining the cursor location relative to the location on the element 
       * that was clicked.  Override this if you want to place the element in a 
       * location other than where the cursor is.
       * @method setDragElPos
       * @param {int} iPageX the X coordinate of the mousedown or drag event
       * @param {int} iPageY the Y coordinate of the mousedown or drag event
       */
      setDragElPos: function(iPageX, iPageY) {
          // the first time we do this, we are going to check to make sure
          // the element has css positioning
  
          var el = this.getDragEl();
          this.alignElWithMouse(el, iPageX, iPageY);
      },
  
      /**
       * Sets the element to the location of the mousedown or click event, 
       * maintaining the cursor location relative to the location on the element 
       * that was clicked.  Override this if you want to place the element in a 
       * location other than where the cursor is.
       * @method alignElWithMouse
       * @param {HTMLElement} el the element to move
       * @param {int} iPageX the X coordinate of the mousedown or drag event
       * @param {int} iPageY the Y coordinate of the mousedown or drag event
       */
      alignElWithMouse: function(el, iPageX, iPageY) {
          var oCoord = this.getTargetCoord(iPageX, iPageY);
          // this.logger.log("****alignElWithMouse : " + el.id + ", " + aCoord + ", " + el.style.display);
  
          if (!this.deltaSetXY) {
              var aCoord = [oCoord.x, oCoord.y];
              YAHOO.util.Dom.setXY(el, aCoord);
  
              var newLeft = parseInt( YAHOO.util.Dom.getStyle(el, "left"), 10 );
              var newTop  = parseInt( YAHOO.util.Dom.getStyle(el, "top" ), 10 );
  
              this.deltaSetXY = [ newLeft - oCoord.x, newTop - oCoord.y ];
          } else {
              YAHOO.util.Dom.setStyle(el, "left", (oCoord.x + this.deltaSetXY[0]) + "px");
              YAHOO.util.Dom.setStyle(el, "top",  (oCoord.y + this.deltaSetXY[1]) + "px");
          }
          
          this.cachePosition(oCoord.x, oCoord.y);
          var self = this;
          setTimeout(function() {
              self.autoScroll.call(self, oCoord.x, oCoord.y, el.offsetHeight, el.offsetWidth);
          }, 0);
      },
  
      /**
       * Saves the most recent position so that we can reset the constraints and
       * tick marks on-demand.  We need to know this so that we can calculate the
       * number of pixels the element is offset from its original position.
       * @method cachePosition
       * @param iPageX the current x position (optional, this just makes it so we
       * don't have to look it up again)
       * @param iPageY the current y position (optional, this just makes it so we
       * don't have to look it up again)
       */
      cachePosition: function(iPageX, iPageY) {
          if (iPageX) {
              this.lastPageX = iPageX;
              this.lastPageY = iPageY;
          } else {
              var aCoord = YAHOO.util.Dom.getXY(this.getEl());
              this.lastPageX = aCoord[0];
              this.lastPageY = aCoord[1];
          }
      },
  
      /**
       * Auto-scroll the window if the dragged object has been moved beyond the 
       * visible window boundary.
       * @method autoScroll
       * @param {int} x the drag element's x position
       * @param {int} y the drag element's y position
       * @param {int} h the height of the drag element
       * @param {int} w the width of the drag element
       * @private
       */
      autoScroll: function(x, y, h, w) {
  
          if (this.scroll) {
              // The client height
              var clientH = this.DDM.getClientHeight();
  
              // The client width
              var clientW = this.DDM.getClientWidth();
  
              // The amt scrolled down
              var st = this.DDM.getScrollTop();
  
              // The amt scrolled right
              var sl = this.DDM.getScrollLeft();
  
              // Location of the bottom of the element
              var bot = h + y;
  
              // Location of the right of the element
              var right = w + x;
  
              // The distance from the cursor to the bottom of the visible area, 
              // adjusted so that we don't scroll if the cursor is beyond the
              // element drag constraints
              var toBot = (clientH + st - y - this.deltaY);
  
              // The distance from the cursor to the right of the visible area
              var toRight = (clientW + sl - x - this.deltaX);
  
              // this.logger.log( " x: " + x + " y: " + y + " h: " + h + 
              // " clientH: " + clientH + " clientW: " + clientW + 
              // " st: " + st + " sl: " + sl + " bot: " + bot + 
              // " right: " + right + " toBot: " + toBot + " toRight: " + toRight);
  
              // How close to the edge the cursor must be before we scroll
              // var thresh = (document.all) ? 100 : 40;
              var thresh = 40;
  
              // How many pixels to scroll per autoscroll op.  This helps to reduce 
              // clunky scrolling. IE is more sensitive about this ... it needs this 
              // value to be higher.
              var scrAmt = (document.all) ? 80 : 30;
  
              // Scroll down if we are near the bottom of the visible page and the 
              // obj extends below the crease
              if ( bot > clientH && toBot < thresh ) { 
                  window.scrollTo(sl, st + scrAmt); 
              }
  
              // Scroll up if the window is scrolled down and the top of the object
              // goes above the top border
              if ( y < st && st > 0 && y - st < thresh ) { 
                  window.scrollTo(sl, st - scrAmt); 
              }
  
              // Scroll right if the obj is beyond the right border and the cursor is
              // near the border.
              if ( right > clientW && toRight < thresh ) { 
                  window.scrollTo(sl + scrAmt, st); 
              }
  
              // Scroll left if the window has been scrolled to the right and the obj
              // extends past the left border
              if ( x < sl && sl > 0 && x - sl < thresh ) { 
                  window.scrollTo(sl - scrAmt, st);
              }
          }
      },
  
      /*
       * Sets up config options specific to this class. Overrides
       * YAHOO.util.DragDrop, but all versions of this method through the 
       * inheritance chain are called
       */
      applyConfig: function() {
          YAHOO.util.DD.superclass.applyConfig.call(this);
          this.scroll = (this.config.scroll !== false);
      },
  
      /*
       * Event that fires prior to the onMouseDown event.  Overrides 
       * YAHOO.util.DragDrop.
       */
      b4MouseDown: function(e) {
          this.setStartPosition();
          // this.resetConstraints();
          this.autoOffset(YAHOO.util.Event.getPageX(e), 
                              YAHOO.util.Event.getPageY(e));
      },
  
      /*
       * Event that fires prior to the onDrag event.  Overrides 
       * YAHOO.util.DragDrop.
       */
      b4Drag: function(e) {
          this.setDragElPos(YAHOO.util.Event.getPageX(e), 
                              YAHOO.util.Event.getPageY(e));
      },
  
      toString: function() {
          return ("DD " + this.id);
      }
  
      //////////////////////////////////////////////////////////////////////////
      // Debugging ygDragDrop events that can be overridden
      //////////////////////////////////////////////////////////////////////////
      /*
      startDrag: function(x, y) {
          this.logger.log(this.id.toString()  + " startDrag");
      },
  
      onDrag: function(e) {
          this.logger.log(this.id.toString() + " onDrag");
      },
  
      onDragEnter: function(e, id) {
          this.logger.log(this.id.toString() + " onDragEnter: " + id);
      },
  
      onDragOver: function(e, id) {
          this.logger.log(this.id.toString() + " onDragOver: " + id);
      },
  
      onDragOut: function(e, id) {
          this.logger.log(this.id.toString() + " onDragOut: " + id);
      },
  
      onDragDrop: function(e, id) {
          this.logger.log(this.id.toString() + " onDragDrop: " + id);
      },
  
      endDrag: function(e) {
          this.logger.log(this.id.toString() + " endDrag");
      }
  
      */
  
  /**
  * @event mouseDownEvent
  * @description Provides access to the mousedown event. The mousedown does not always result in a drag operation.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4MouseDownEvent
  * @description Provides access to the mousedown event, before the mouseDownEvent gets fired. Returning false will cancel the drag.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event mouseUpEvent
  * @description Fired from inside DragDropMgr when the drag operation is finished.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4StartDragEvent
  * @description Fires before the startDragEvent, returning false will cancel the startDrag Event.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event startDragEvent
  * @description Occurs after a mouse down and the drag threshold has been met. The drag threshold default is either 3 pixels of mouse movement or 1 full second of holding the mousedown. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4EndDragEvent
  * @description Fires before the endDragEvent. Returning false will cancel.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event endDragEvent
  * @description Fires on the mouseup event after a drag has been initiated (startDrag fired).
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event dragEvent
  * @description Occurs every mousemove event while dragging.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragEvent
  * @description Fires before the dragEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event invalidDropEvent
  * @description Fires when the dragged objects is dropped in a location that contains no drop targets.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOutEvent
  * @description Fires before the dragOutEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOutEvent
  * @description Fires when a dragged object is no longer over an object that had the onDragEnter fire. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragEnterEvent
  * @description Occurs when the dragged object first interacts with another targettable drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOverEvent
  * @description Fires before the dragOverEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOverEvent
  * @description Fires every mousemove event while over a drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragDropEvent 
  * @description Fires before the dragDropEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragDropEvent
  * @description Fires when the dragged objects is dropped on another.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  });
  /**
   * A DragDrop implementation that inserts an empty, bordered div into
   * the document that follows the cursor during drag operations.  At the time of
   * the click, the frame div is resized to the dimensions of the linked html
   * element, and moved to the exact location of the linked element.
   *
   * References to the "frame" element refer to the single proxy element that
   * was created to be dragged in place of all DDProxy elements on the
   * page.
   *
   * @class DDProxy
   * @extends YAHOO.util.DD
   * @constructor
   * @param {String} id the id of the linked html element
   * @param {String} sGroup the group of related DragDrop objects
   * @param {object} config an object containing configurable attributes
   *                Valid properties for DDProxy in addition to those in DragDrop: 
   *                   resizeFrame, centerFrame, dragElId
   */
  YAHOO.util.DDProxy = function(id, sGroup, config) {
      if (id) {
          this.init(id, sGroup, config);
          this.initFrame(); 
      }
  };
  
  /**
   * The default drag frame div id
   * @property YAHOO.util.DDProxy.dragElId
   * @type String
   * @static
   */
  YAHOO.util.DDProxy.dragElId = "ygddfdiv";
  
  YAHOO.extend(YAHOO.util.DDProxy, YAHOO.util.DD, {
  
      /**
       * By default we resize the drag frame to be the same size as the element
       * we want to drag (this is to get the frame effect).  We can turn it off
       * if we want a different behavior.
       * @property resizeFrame
       * @type boolean
       */
      resizeFrame: true,
  
      /**
       * By default the frame is positioned exactly where the drag element is, so
       * we use the cursor offset provided by YAHOO.util.DD.  Another option that works only if
       * you do not have constraints on the obj is to have the drag frame centered
       * around the cursor.  Set centerFrame to true for this effect.
       * @property centerFrame
       * @type boolean
       */
      centerFrame: false,
  
      /**
       * Creates the proxy element if it does not yet exist
       * @method createFrame
       */
      createFrame: function() {
          var self=this, body=document.body;
  
          if (!body || !body.firstChild) {
              setTimeout( function() { self.createFrame(); }, 50 );
              return;
          }
  
          var div=this.getDragEl(), Dom=YAHOO.util.Dom;
  
          if (!div) {
              div    = document.createElement("div");
              div.id = this.dragElId;
              var s  = div.style;
  
              s.position   = "absolute";
              s.visibility = "hidden";
              s.cursor     = "move";
              s.border     = "2px solid #aaa";
              s.zIndex     = 999;
              s.height     = "25px";
              s.width      = "25px";
  
              var _data = document.createElement('div');
              Dom.setStyle(_data, 'height', '100%');
              Dom.setStyle(_data, 'width', '100%');
              /**
              * If the proxy element has no background-color, then it is considered to the "transparent" by Internet Explorer.
              * Since it is "transparent" then the events pass through it to the iframe below.
              * So creating a "fake" div inside the proxy element and giving it a background-color, then setting it to an
              * opacity of 0, it appears to not be there, however IE still thinks that it is so the events never pass through.
              */
              Dom.setStyle(_data, 'background-color', '#ccc');
              Dom.setStyle(_data, 'opacity', '0');
              div.appendChild(_data);
  
              // appendChild can blow up IE if invoked prior to the window load event
              // while rendering a table.  It is possible there are other scenarios 
              // that would cause this to happen as well.
              body.insertBefore(div, body.firstChild);
          }
      },
  
      /**
       * Initialization for the drag frame element.  Must be called in the
       * constructor of all subclasses
       * @method initFrame
       */
      initFrame: function() {
          this.createFrame();
      },
  
      applyConfig: function() {
          //this.logger.log("DDProxy applyConfig");
          YAHOO.util.DDProxy.superclass.applyConfig.call(this);
  
          this.resizeFrame = (this.config.resizeFrame !== false);
          this.centerFrame = (this.config.centerFrame);
          this.setDragElId(this.config.dragElId || YAHOO.util.DDProxy.dragElId);
      },
  
      /**
       * Resizes the drag frame to the dimensions of the clicked object, positions 
       * it over the object, and finally displays it
       * @method showFrame
       * @param {int} iPageX X click position
       * @param {int} iPageY Y click position
       * @private
       */
      showFrame: function(iPageX, iPageY) {
          var el = this.getEl();
          var dragEl = this.getDragEl();
          var s = dragEl.style;
  
          this._resizeProxy();
  
          if (this.centerFrame) {
              this.setDelta( Math.round(parseInt(s.width,  10)/2), 
                             Math.round(parseInt(s.height, 10)/2) );
          }
  
          this.setDragElPos(iPageX, iPageY);
  
          YAHOO.util.Dom.setStyle(dragEl, "visibility", "visible"); 
      },
  
      /**
       * The proxy is automatically resized to the dimensions of the linked
       * element when a drag is initiated, unless resizeFrame is set to false
       * @method _resizeProxy
       * @private
       */
      _resizeProxy: function() {
          if (this.resizeFrame) {
              var DOM    = YAHOO.util.Dom;
              var el     = this.getEl();
              var dragEl = this.getDragEl();
  
              var bt = parseInt( DOM.getStyle(dragEl, "borderTopWidth"    ), 10);
              var br = parseInt( DOM.getStyle(dragEl, "borderRightWidth"  ), 10);
              var bb = parseInt( DOM.getStyle(dragEl, "borderBottomWidth" ), 10);
              var bl = parseInt( DOM.getStyle(dragEl, "borderLeftWidth"   ), 10);
  
              if (isNaN(bt)) { bt = 0; }
              if (isNaN(br)) { br = 0; }
              if (isNaN(bb)) { bb = 0; }
              if (isNaN(bl)) { bl = 0; }
  
              this.logger.log("proxy size: " + bt + "  " + br + " " + bb + " " + bl);
  
              var newWidth  = Math.max(0, el.offsetWidth  - br - bl);                                                                                           
              var newHeight = Math.max(0, el.offsetHeight - bt - bb);
  
              this.logger.log("Resizing proxy element");
  
              DOM.setStyle( dragEl, "width",  newWidth  + "px" );
              DOM.setStyle( dragEl, "height", newHeight + "px" );
          }
      },
  
      // overrides YAHOO.util.DragDrop
      b4MouseDown: function(e) {
          this.setStartPosition();
          var x = YAHOO.util.Event.getPageX(e);
          var y = YAHOO.util.Event.getPageY(e);
          this.autoOffset(x, y);
  
          // This causes the autoscroll code to kick off, which means autoscroll can
          // happen prior to the check for a valid drag handle.
          // this.setDragElPos(x, y);
      },
  
      // overrides YAHOO.util.DragDrop
      b4StartDrag: function(x, y) {
          // show the drag frame
          this.logger.log("start drag show frame, x: " + x + ", y: " + y);
          this.showFrame(x, y);
      },
  
      // overrides YAHOO.util.DragDrop
      b4EndDrag: function(e) {
          this.logger.log(this.id + " b4EndDrag");
          YAHOO.util.Dom.setStyle(this.getDragEl(), "visibility", "hidden"); 
      },
  
      // overrides YAHOO.util.DragDrop
      // By default we try to move the element to the last location of the frame.  
      // This is so that the default behavior mirrors that of YAHOO.util.DD.  
      endDrag: function(e) {
          var DOM = YAHOO.util.Dom;
          this.logger.log(this.id + " endDrag");
          var lel = this.getEl();
          var del = this.getDragEl();
  
          // Show the drag frame briefly so we can get its position
          // del.style.visibility = "";
          DOM.setStyle(del, "visibility", ""); 
  
          // Hide the linked element before the move to get around a Safari 
          // rendering bug.
          //lel.style.visibility = "hidden";
          DOM.setStyle(lel, "visibility", "hidden"); 
          YAHOO.util.DDM.moveToEl(lel, del);
          //del.style.visibility = "hidden";
          DOM.setStyle(del, "visibility", "hidden"); 
          //lel.style.visibility = "";
          DOM.setStyle(lel, "visibility", ""); 
      },
  
      toString: function() {
          return ("DDProxy " + this.id);
      }
  /**
  * @event mouseDownEvent
  * @description Provides access to the mousedown event. The mousedown does not always result in a drag operation.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4MouseDownEvent
  * @description Provides access to the mousedown event, before the mouseDownEvent gets fired. Returning false will cancel the drag.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event mouseUpEvent
  * @description Fired from inside DragDropMgr when the drag operation is finished.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4StartDragEvent
  * @description Fires before the startDragEvent, returning false will cancel the startDrag Event.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event startDragEvent
  * @description Occurs after a mouse down and the drag threshold has been met. The drag threshold default is either 3 pixels of mouse movement or 1 full second of holding the mousedown. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event b4EndDragEvent
  * @description Fires before the endDragEvent. Returning false will cancel.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event endDragEvent
  * @description Fires on the mouseup event after a drag has been initiated (startDrag fired).
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  /**
  * @event dragEvent
  * @description Occurs every mousemove event while dragging.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragEvent
  * @description Fires before the dragEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event invalidDropEvent
  * @description Fires when the dragged objects is dropped in a location that contains no drop targets.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOutEvent
  * @description Fires before the dragOutEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOutEvent
  * @description Fires when a dragged object is no longer over an object that had the onDragEnter fire. 
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragEnterEvent
  * @description Occurs when the dragged object first interacts with another targettable drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragOverEvent
  * @description Fires before the dragOverEvent.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragOverEvent
  * @description Fires every mousemove event while over a drag and drop object.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event b4DragDropEvent 
  * @description Fires before the dragDropEvent
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  /**
  * @event dragDropEvent
  * @description Fires when the dragged objects is dropped on another.
  * @type YAHOO.util.CustomEvent See <a href="YAHOO.util.Element.html#addListener">Element.addListener</a> for more information on listening for this event.
  */
  
  });
  /**
   * A DragDrop implementation that does not move, but can be a drop 
   * target.  You would get the same result by simply omitting implementation 
   * for the event callbacks, but this way we reduce the processing cost of the 
   * event listener and the callbacks.
   * @class DDTarget
   * @extends YAHOO.util.DragDrop 
   * @constructor
   * @param {String} id the id of the element that is a drop target
   * @param {String} sGroup the group of related DragDrop objects
   * @param {object} config an object containing configurable attributes
   *                 Valid properties for DDTarget in addition to those in 
   *                 DragDrop: 
   *                    none
   */
  YAHOO.util.DDTarget = function(id, sGroup, config) {
      if (id) {
          this.initTarget(id, sGroup, config);
      }
  };
  
  // YAHOO.util.DDTarget.prototype = new YAHOO.util.DragDrop();
  YAHOO.extend(YAHOO.util.DDTarget, YAHOO.util.DragDrop, {
      toString: function() {
          return ("DDTarget " + this.id);
      }
  });
  YAHOO.register("dragdrop", YAHOO.util.DragDropMgr, {version: "2.7.0r2", build: "1799"});
  