text: /* Copyright (c) 2006 Brandon Aaron (http://brandonaaron.net)
   * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
   * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
   *
   * $LastChangedDate: 2007-07-21 18:44:59 -0500 (Sat, 21 Jul 2007) $
   * $Rev: 2446 $
   *
   * Version 2.1.1
   */
  
  (function($){
  
  /**
   * The bgiframe is chainable and applies the iframe hack to get
   * around zIndex issues in IE6. It will only apply itself in IE6
   * and adds a class to the iframe called 'bgiframe'. The iframe
   * is appeneded as the first child of the matched element(s)
   * with a tabIndex and zIndex of -1.
   *
   * By default the plugin will take borders, sized with pixel units,
   * into account. If a different unit is used for the border's width,
   * then you will need to use the top and left settings as explained below.
   *
   * NOTICE: This plugin has been reported to cause perfromance problems
   * when used on elements that change properties (like width, height and
   * opacity) a lot in IE6. Most of these problems have been caused by
   * the expressions used to calculate the elements width, height and
   * borders. Some have reported it is due to the opacity filter. All
   * these settings can be changed if needed as explained below.
   *
   * @example $('div').bgiframe();
   * @before <div><p>Paragraph</p></div>
   * @result <div><iframe class="bgiframe".../><p>Paragraph</p></div>
   *
   * @param Map settings Optional settings to configure the iframe.
   * @option String|Number top The iframe must be offset to the top
   * 		by the width of the top border. This should be a negative
   *      number representing the border-top-width. If a number is
   * 		is used here, pixels will be assumed. Otherwise, be sure
   *		to specify a unit. An expression could also be used.
   * 		By default the value is "auto" which will use an expression
   * 		to get the border-top-width if it is in pixels.
   * @option String|Number left The iframe must be offset to the left
   * 		by the width of the left border. This should be a negative
   *      number representing the border-left-width. If a number is
   * 		is used here, pixels will be assumed. Otherwise, be sure
   *		to specify a unit. An expression could also be used.
   * 		By default the value is "auto" which will use an expression
   * 		to get the border-left-width if it is in pixels.
   * @option String|Number width This is the width of the iframe. If
   *		a number is used here, pixels will be assume. Otherwise, be sure
   * 		to specify a unit. An experssion could also be used.
   *		By default the value is "auto" which will use an experssion
   * 		to get the offsetWidth.
   * @option String|Number height This is the height of the iframe. If
   *		a number is used here, pixels will be assume. Otherwise, be sure
   * 		to specify a unit. An experssion could also be used.
   *		By default the value is "auto" which will use an experssion
   * 		to get the offsetHeight.
   * @option Boolean opacity This is a boolean representing whether or not
   * 		to use opacity. If set to true, the opacity of 0 is applied. If
   *		set to false, the opacity filter is not applied. Default: true.
   * @option String src This setting is provided so that one could change
   *		the src of the iframe to whatever they need.
   *		Default: "javascript:false;"
   *
   * @name bgiframe
   * @type jQuery
   * @cat Plugins/bgiframe
   * @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
   */
  $.fn.bgIframe = $.fn.bgiframe = function(s) {
  	// This is only for IE6
  	if ( $.browser.msie && /6.0/.test(navigator.userAgent) ) {
  		s = $.extend({
  			top     : 'auto', // auto == .currentStyle.borderTopWidth
  			left    : 'auto', // auto == .currentStyle.borderLeftWidth
  			width   : 'auto', // auto == offsetWidth
  			height  : 'auto', // auto == offsetHeight
  			opacity : true,
  			src     : 'javascript:false;'
  		}, s || {});
  		var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
  		    html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
  		               'style="display:block;position:absolute;z-index:-1;'+
  			               (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
  					       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
  					       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
  					       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
  					       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
  					'"/>';
  		return this.each(function() {
  			if ( $('> iframe.bgiframe', this).length == 0 )
  				this.insertBefore( document.createElement(html), this.firstChild );
  		});
  	}
  	return this;
  };
  
  })(jQuery);