text: // $Id: farbtastic.js,v 1.2 2007/01/08 22:53:01 unconed Exp $
  // Farbtastic 1.2
  
  var farbtastic_click = false;
  
  jQuery.fn.farbtastic = function (callback) {
    jQuery.farbtastic(this, callback);
    return this;
  };
  
  jQuery.farbtastic = function (container, callback) {
    var container = jQuery(container).get(0);
    return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
  }
  
  jQuery._farbtastic = function (container, callback) {
    // Store farbtastic object
    var fb = this;
  
    // Insert markup
    jQuery(container).html('<div class="farbtastic"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>');
    var e = jQuery('.farbtastic', container);
    fb.wheel = jQuery('.wheel', container).get(0);
    // Dimensions
    fb.radius = 84;
    fb.square = 100;
    fb.width = 194;
  
    // Fix background PNGs in IE6
    if (navigator.appVersion.match(/MSIE [0-6]\./)) {
      jQuery('*', e).each(function () {
        if (this.currentStyle.backgroundImage != 'none') {
          var image = this.currentStyle.backgroundImage;
          image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
          jQuery(this).css({
            'backgroundImage': 'none',
            'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
          });
        }
      });
    }
  
    /**
     * Link to the given element(s) or callback.
     */
    fb.linkTo = function (callback) {
      // Unbind previous nodes
      if (typeof fb.callback == 'object') {
        jQuery(fb.callback).unbind('keyup', fb.updateValue);
      }
  
      // Reset color
      fb.color = null;
  
      // Bind callback or elements
      if (typeof callback == 'function') {
        fb.callback = callback;
      }
      else if (typeof callback == 'object' || typeof callback == 'string') {
        fb.callback = jQuery(callback);
        fb.callback.bind('keyup', fb.updateValue);
        if (fb.callback.get(0).value) {
          fb.setColor(fb.callback.get(0).value);
        }
      }
      return this;
    }
    fb.updateValue = function (event) {
      if (this.value && this.value != fb.color) {
        fb.setColor(this.value);
      }
    }
  
    /**
     * Change color with HTML syntax #123456
     */
    fb.setColor = function (color) {
      var unpack = fb.unpack(color);
      if (fb.color != color && unpack) {
        fb.color = color;
        fb.rgb = unpack;
        fb.hsl = fb.RGBToHSL(fb.rgb);
        fb.updateDisplay();
      }
      return this;
    }
  
    /**
     * Change color with HSL triplet [0..1, 0..1, 0..1]
     */
    fb.setHSL = function (hsl) {
      fb.hsl = hsl;
      fb.rgb = fb.HSLToRGB(hsl);
      fb.color = fb.pack(fb.rgb);
      fb.updateDisplay();
      return this;
    }
  
    /////////////////////////////////////////////////////
  
    /**
     * Retrieve the coordinates of the given event relative to the center
     * of the widget.
     */
    fb.widgetCoords = function (event) {
      var x, y;
      var el = event.target || event.srcElement;
      var reference = fb.wheel;
  
      if (typeof event.offsetX != 'undefined') {
        // Use offset coordinates and find common offsetParent
        var pos = { x: event.offsetX, y: event.offsetY };
  
        // Send the coordinates upwards through the offsetParent chain.
        var e = el;
        while (e) {
          e.mouseX = pos.x;
          e.mouseY = pos.y;
          pos.x += e.offsetLeft;
          pos.y += e.offsetTop;
          e = e.offsetParent;
        }
  
        // Look for the coordinates starting from the wheel widget.
        var e = reference;
        var offset = { x: 0, y: 0 }
        while (e) {
          if (typeof e.mouseX != 'undefined') {
            x = e.mouseX - offset.x;
            y = e.mouseY - offset.y;
            break;
          }
          offset.x += e.offsetLeft;
          offset.y += e.offsetTop;
          e = e.offsetParent;
        }
  
        // Reset stored coordinates
        e = el;
        while (e) {
          e.mouseX = undefined;
          e.mouseY = undefined;
          e = e.offsetParent;
        }
      }
      else {
        // Use absolute coordinates
        var pos = fb.absolutePosition(reference);
        x = (event.pageX || 0*(event.clientX + jQuery('html').get(0).scrollLeft)) - pos.x;
        y = (event.pageY || 0*(event.clientY + jQuery('html').get(0).scrollTop)) - pos.y;
      }
      // Subtract distance to middle
      return { x: x - fb.width / 2, y: y - fb.width / 2 };
    }
  
    /**
     * Mousedown handler
     */
    fb.mousedown = function (event) {
  	farbtastic_click = true;
      // Capture mouse
      if (!document.dragging) {
        jQuery(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
        document.dragging = true;
      }
  
      // Check which area is being dragged
      var pos = fb.widgetCoords(event);
      fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
  
      // Process
      fb.mousemove(event);
      return false;
    }
  
    /**
     * Mousemove handler
     */
    fb.mousemove = function (event) {
      // Get coordinates relative to color picker center
      var pos = fb.widgetCoords(event);
  
      // Set new HSL parameters
      if (fb.circleDrag) {
        var hue = Math.atan2(pos.x, -pos.y) / 6.28;
        if (hue < 0) hue += 1;
        fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
      }
      else {
        var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
        var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
        fb.setHSL([fb.hsl[0], sat, lum]);
      }
      return false;
    }
  
    /**
     * Mouseup handler
     */
    fb.mouseup = function () {
      // Uncapture mouse
  	farbtastic_click = false;
      jQuery(document).unbind('mousemove', fb.mousemove);
      jQuery(document).unbind('mouseup', fb.mouseup);
      document.dragging = false;
    }
  
    /**
     * Update the markers and styles
     */
    fb.updateDisplay = function () {
      // Markers
      var angle = fb.hsl[0] * 6.28;
      jQuery('.h-marker', e).css({
        left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
        top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
      });
  
      jQuery('.sl-marker', e).css({
        left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
        top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
      });
  
      // Saturation/Luminance gradient
      jQuery('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
  
      // Linked elements or callback
      if (typeof fb.callback == 'object') {
        // Set background/foreground color
        jQuery(fb.callback).css({
          backgroundColor: fb.color,
          color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
        });
  
        // Change linked value
        jQuery(fb.callback).each(function() {
          if (this.value && this.value != fb.color) {
            this.value = fb.color;
          }
        });
      }
      else if (typeof fb.callback == 'function') {
        fb.callback.call(fb, fb.color);
      }
    }
  
    /**
     * Get absolute position of element
     */
    fb.absolutePosition = function (el) {
      var r = { x: el.offsetLeft, y: el.offsetTop };
      // Resolve relative to offsetParent
      if (el.offsetParent) {
        var tmp = fb.absolutePosition(el.offsetParent);
        r.x += tmp.x;
        r.y += tmp.y;
      }
      return r;
    };
  
    /* Various color utility functions */
    fb.pack = function (rgb) {
      var r = Math.round(rgb[0] * 255);
      var g = Math.round(rgb[1] * 255);
      var b = Math.round(rgb[2] * 255);
      return '#' + (r < 16 ? '0' : '') + r.toString(16) +
             (g < 16 ? '0' : '') + g.toString(16) +
             (b < 16 ? '0' : '') + b.toString(16);
    }
  
    fb.unpack = function (color) {
      if (color.length == 7) {
        return [parseInt('0x' + color.substring(1, 3)) / 255,
          parseInt('0x' + color.substring(3, 5)) / 255,
          parseInt('0x' + color.substring(5, 7)) / 255];
      }
      else if (color.length == 4) {
        return [parseInt('0x' + color.substring(1, 2)) / 15,
          parseInt('0x' + color.substring(2, 3)) / 15,
          parseInt('0x' + color.substring(3, 4)) / 15];
      }
    }
  
    fb.HSLToRGB = function (hsl) {
      var m1, m2, r, g, b;
      var h = hsl[0], s = hsl[1], l = hsl[2];
      m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
      m1 = l * 2 - m2;
      return [this.hueToRGB(m1, m2, h+0.33333),
          this.hueToRGB(m1, m2, h),
          this.hueToRGB(m1, m2, h-0.33333)];
    }
  
    fb.hueToRGB = function (m1, m2, h) {
      h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
      if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
      if (h * 2 < 1) return m2;
      if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
      return m1;
    }
  
    fb.RGBToHSL = function (rgb) {
      var min, max, delta, h, s, l;
      var r = rgb[0], g = rgb[1], b = rgb[2];
      min = Math.min(r, Math.min(g, b));
      max = Math.max(r, Math.max(g, b));
      delta = max - min;
      l = (min + max) / 2;
      s = 0;
      if (l > 0 && l < 1) {
        s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
      }
      h = 0;
      if (delta > 0) {
        if (max == r && max != g) h += (g - b) / delta;
        if (max == g && max != b) h += (2 + (b - r) / delta);
        if (max == b && max != r) h += (4 + (r - g) / delta);
        h /= 6;
      }
      return [h, s, l];
    }
  
    // Install mousedown handler (the others are set on the document on-demand)
    jQuery('*', e).mousedown(fb.mousedown);
  
      // Init color
    fb.setColor('#000000');
  
    // Set linked elements/callback
    if (callback) {
      fb.linkTo(callback);
    }
  }