// JavaScript Document
function nav()
{
    var oNav = document.getElementById('nav');
	var aLi = oNav.getElementsByTagName('li');
	for(var i=0;i<aLi.length;i++)
	{
		aLi[i].onmouseover = function ()
		{
			this.className = 'hover';
		};
		aLi[i].onmouseout = function ()
		{
			this.className = '';
		};
	};
};
// 二级页弹出菜单
function show(){
	var oTil = document.getElementById('til_lf_sub');
	var oBox = document.getElementById('son_lf_sub');
	var timer = null;
	oTil.onmouseover = oBox.onmouseover = function (){
		clearTimeout(timer);
        timer = setTimeout(function (){
            oBox.style.display = 'block';
        },100)
	};
	oTil.onmouseout = oBox.onmouseout = function (){
		clearTimeout(timer);
        timer = setTimeout(function (){
            oBox.style.display = 'none';
        },100)
	};
}