/* 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: 2007-02-18 22:09:54-0600 (Sun, 18 Feb 2007) $
* $Rev: 1379 $
*/
/**
* The bgiframe is chainable and applies the iframe hack to get
* around zIndex issues in IE6. It will only apply itself in IE
* and adds a class to the iframe called 'bgiframe'.
*
* It does take borders into consideration but all values
* need to be in pixels and the element needs to have
* position relative or absolute.
*
* NOTICE: This plugin uses CSS expersions in order to work
* with an element's borders, height and with and can result in poor
* performance when used on an element that changes properties
* like size and position a lot. Two of these expressions can be
* removed if border doesn't matter and performance does.
* See lines 39 and 40 below and set top: 0 and left: 0
* instead of their current values.
*
* @example $('div').bgiframe();
* @before <div><p>Paragraph</p></div>
* @result <div><iframe class="bgiframe".../><p>Paragraph</p></div>
*
* @name bgiframe
* @type jQuery
* @cat Plugins/bgiframe
* @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
*/
jQuery.fn.bgIframe = jQuery.fn.bgiframe = function() {
if ( !(jQuery.browser.msie && typeof XMLHttpRequest == 'function') ) return this;
var html = '<iframe class="bgiframe" src="javascript:false;document.write(\'\');" tabindex="-1" '
+'style="display:block; position:absolute; '
+'top: expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)  || 0) *-1)+\'px\'); '
+'left:expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth) || 0) *-1)+\'px\'); '
+'z-index:-1; filter:Alpha(Opacity=\'0\'); '
+'width:expression(this.parentNode.offsetWidth+\'px\'); '
+'height:expression(this.parentNode.offsetHeight+\'px\')"/>';
return this.each(function() {
if ( !jQuery('iframe.bgiframe', this)[0] )
this.insertBefore( document.createElement(html), this.firstChild );
});
};