Metacat

/*! 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);