//TAB
function Tab(name,cursel,n){
for(i=1;i<=n;i++){
var menu=document.getElementById(name+i);
var aon=document.getElementById("aon_"+name+"_"+i);
menu.className=i==cursel?"tab_1":"";
aon.style.display=i==cursel?"block":"none";
}
}
//导航
function show(a){
hid()
document.getElementById("n_"+a).style.display="block"
}
function hid(){
for(var j=1;j<5;j++){
	document.getElementById("n_"+j).style.display="none"
}
}