function ShoworHidesubmenu(li){
var myli=li.value;
var submenu=myli.getElementsByTagName("ul")[0];
if(submenu.style.display=="none")
{
submenu.style.display = "block";
}
else{
submenu.style.display="none";
}
}
//鼠标移入移出时显示与隐藏二级菜单
window.onload=function(){
var aLi=document.getElementsByTagName('li');
for(var i=0; i