$.fn.fadeBackgroundImage = function(url){
	var t = this;
	//create an img so the browser will download the image:
	$('<img />').attr('src', url)
	.load(function(){ //attach onload to set background-image
		t.each(function(){ 
			$(this).css('backgroundImage', 'url('+url+')' );
		});
	});
	return this;
}