/**
 * @example $('div').bgiframe();
 * @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
 */

(function($){

$.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);