$(document).ready(function(){
	var up_image;
	var over_image;
	$('.menu_level1').mouseover(function(){
		obj = $(' > .ml_icon',this.parentNode);
		up_image = $(obj).attr('src');
		over_image = $(obj).attr('rel')!=""?$(obj).attr('rel'):up_image;
		$(obj).attr('src',over_image);
	}).mouseout(function(){
		$(obj).attr('src',up_image);
	}).mousedown(function(){
		$(obj).attr('src',over_image);
	}).mouseup(function(){
		$(obj).attr('src',over_image);
	});
});