doMenu = function() {
var els = document.getElementById("nav").getElementsByTagName("LI");
for (var i=0; i<els.length; i++) {
els[i].onclick=function() {
var els2 = document.getElementById("nav").getElementsByTagName("LI");
for (var i=0; i<els2.length; i++) {
els2[i].className=els2[i].className.replace(new RegExp("show"), "");
}
this.className+="show";
}
}
}
//*** This code is copyright 2003 by Gavin Kistner, gavin@refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
function AttachEvent(obj,evt,fnc,useCapture){
if (!useCapture) useCapture=false;
if (obj.addEventListener){
obj.addEventListener(evt,fnc,useCapture);
return true;
} else if (obj.attachEvent) return obj.attachEvent("on"+evt,fnc);
else{
MyAttachEvent(obj,evt,fnc);
obj['on'+evt]=function(){ MyFireEvent(obj,evt) };
}
} 
function MyAttachEvent(obj,evt,fnc){
if (!obj.myEvents) obj.myEvents={};
if (!obj.myEvents[evt]) obj.myEvents[evt]=[];
var evts = obj.myEvents[evt];
evts[evts.length]=fnc;
}
function MyFireEvent(obj,evt){
if (!obj || !obj.myEvents || !obj.myEvents[evt]) return;
var evts = obj.myEvents[evt];
for (var i=0,len=evts.length;i<len;i++) evts[i]();
}
AttachEvent(window,'load',doMenu,false);