function showMenu(menu)
{
				var menuTdId = menu.id;
				var subMenu;//用于存放子菜单对象! 用js控制各个子菜单显示的时刻，用css样式来控制各个子菜单显示的位置
				for(var i = 1;i <= 9; i++)
				{
					subMenu = document.getElementById("sub" + i);
					if(menuTdId == "nav" + i)
					{
						subMenu.style.display = "block";
					}
					else
					{
						subMenu.style.display = "none";	
					}
				}
}



        			
function showMenu2(menu)
{
		var subMenu = document.getElementById(menu.id);
		subMenu.style.display = "block";	
}

			
function hide()
{
	setTimeout('hideWaiCeng()',2000);	
}

function hideWaiCeng()
{
	document.getElementById("waiceng").style.visibility = "hidden";
}

function showWaiCeng()
{
	document.getElementById("waiceng").style.visibility = "visible";
}