<!--
//显示隐藏层1
function display_hidden(num,img){
      var menu=document.getElementById(num);
            if (menu.style.display=="block"){
                menu.style.display="none";
                document.getElementById(img).style.background="url(qt_images/list_1.gif) no-repeat 50% left";
            } else {
                menu.style.display="block";
                document.getElementById(img).style.background="url(qt_images/list_2.gif) no-repeat 50% left";
            }
}

//显示隐藏层2
function opencat(cat,img){
	if(cat.style.display=="none"){
	cat.style.display="";
	img.src="img/class2.gif";
	}	else {
	cat.style.display="none"; 
	img.src="img/class1.gif";
	}
}
-->