var InternetExplorer = navigator.appName.indexOf("Microsoft") != -1;
var client_browse = "";
if(document.getElementById)
{client_browse="ie5";}	// IE5+,NN6+	document.getElementById("id")
else if(document.all)
{client_browse="ie4";}	// IE4	document.all("id");
else if(document.layers)
{client_browse="ns4";}	// NN4	document.layers["id"];
function get(strname)
{
switch(client_browse){
case "ie5":
return document.getElementById(strname);
break;
case "ns4":
return document.layers[strname];
break;
default:	//"ie4"
return document.all(strname);
break;
}
}
function menuDisplay(obj, n){
for(i=1; i<=n; i++){
get("li_" + i).style.display = "none";
}
get("li_" + obj).style.display = "block";
}// JavaScript Document