/* 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.
 */
(function($){
$.fn.bgIframe = jQuery.fn.bgiframe = function(s) {
	if ( !($.browser.msie && typeof XMLHttpRequest == 'function') ) return this;
	s = $.extend({
		top     : 'auto',
		left    : 'auto',
		width   : 'auto',
		height  : 'auto',
		opacity : true,
		src     : 'javascript:false;'
	}, s || {});
	var prop = function(n){return n&&n.constructor==Number?n+'px':n;},
	    html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
	               'style="display:block;position:absolute;z-index:-1;'+
		               (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
				       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
				       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
				       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
				       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
				'"/>';
	return this.each(function() {
		if ( !$('iframe.bgiframe', this)[0] )
			this.insertBefore( document.createElement(html), this.firstChild );
	});
};
})(jQuery);