// JavaScript Document

function show(obj)
{
	document.getElementById(obj).style.display="block";
}

function disappear(obj)
{
	document.getElementById(obj).style.display="none";
}

function show_pri(obj){
	document.getElementById(obj).style.backgroundImage="url(images/nav.gif)";
}

function disappear_pri(obj){
	document.getElementById(obj).style.backgroundImage="";
}

//导航 效果