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+/* 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);
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