/*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
* Licensed under the MIT License (LICENSE.txt).
*
* Version 2.1.2
*/

(function ($) {

	$.fn.bgiframe = ($.browser.msie && /msie 6\.0/i.test(navigator.userAgent) ? function (s) {
		s = $.extend({
			top: 'auto', // auto == .currentStyle.borderTopWidth
			left: 'auto', // auto == .currentStyle.borderLeftWidth
			width: 'auto', // auto == offsetWidth
			height: 'auto', // auto == offsetHeight
			opacity: true,
			src: 'javascript:false;'
		}, s);
		var html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="' + s.src + '"' +
                   'style="display:block;position:absolute;z-index:-1;' +
                       (s.opacity !== false ? 'filter:Alpha(Opacity=\'0\');' : '') +
                       'top:' + (s.top == 'auto' ? 'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')' : prop(s.top)) + ';' +
                       'left:' + (s.left == 'auto' ? 'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')' : prop(s.left)) + ';' +
                       'width:' + (s.width == 'auto' ? 'expression(this.parentNode.offsetWidth+\'px\')' : prop(s.width)) + ';' +
                       'height:' + (s.height == 'auto' ? 'expression(this.parentNode.offsetHeight+\'px\')' : prop(s.height)) + ';' +
                '"/>';
		return this.each(function () {
			if ($(this).children('iframe.bgiframe').length === 0)
				this.insertBefore(document.createElement(html), this.firstChild);
		});
	} : function () { return this; });

	// old alias
	$.fn.bgIframe = $.fn.bgiframe;

	function prop(n) {
		return n && n.constructor === Number ? n + 'px' : n;
	}

})(jQuery);