jQuery(document).ready(function(){
	
	  //导航的产品显示
		jQuery("#product_menu a").hover(function(){
			jQuery("#product_class").animate({
				opacity: "show",
				top: "150"
			}, "fast");
		});
	//导航的产品关闭	
		jQuery("#close_button").click(function(){
			jQuery("#product_class").animate({
				opacity: "hide",
				top: "120"
			}, "fast");
		});
		
	});