AnyLink Menu Won't "Drop Down"

[QuickScriptz]

1) Script Title: AnyLink Drop Down Menu

2) Script URL (on DD): Click Here

3) Describe problem: After a certain period of time the menus just won't drop down anymore. Refer to bottom of my post for link and demo. IE give me these two following script errors:

Line:114
Char:1
Code:0
Error:'dropmenuobj' is null or not an object
URL:http://quickscriptz.ca/djpanel4/usercp.php?show=home

Line:157
Char:1
Code:0
Error:Object required
URL:http://quickscriptz.ca/djpanel4/usercp.php?show=home

I've modified the js code slightly so I'm not sure if I've made something go weird or what exactly has happened... I've integrated some php so that might be part of the problem, anyways heres the code:

<script type="text/javascript">
<?php
require('connect.php');
$result = mysql_query("SELECT language FROM rp4_settings");
$row = mysql_fetch_array($result);
$templang = $row['language'];
$langfile = "languages/$templang.php";
require($langfile);
function num($input, $link){
    echo '<a href="'.$link.'"><img src="images/arrow.gif" border="0" /> ';
    echo $input;
    echo '</a>';
}
?>
/***********************************************
* Based on Dynamic Drive's AnyLink Vertical Menu
* Original Version - © Dynamic Drive
* Modified Version - © QuickScriptz Design
***********************************************/

var menu1=new Array() //Radio
menu1[0]='<?php num($menu10, 'radio.php?do=news');?>' 
menu1[1]='<?php num($menu11, 'radio.php?do=rules');?>' 
menu1[2]='<?php num($menu12, 'radio.php?do=stafflist');?>' 
menu1[3]='<?php num($menu13, 'radio.php?do=emaillist');?>' 
menu1[4]='<?php num($menu14, 'radio.php?do=serverd');?>' 

var menu2=new Array() //Chat
menu2[0]='<?php num($menu20, 'chat.php?do=staffchat');?>' 
menu2[1]='<?php num($menu21, 'chat.php?do=alertsite');?>' 
menu2[2]='<?php num($menu22, 'chat.php?do=alertvisitor');?>' 
menu2[3]='<?php num($menu23, 'chat.php?do=alertdj');?>' 

var menu3=new Array() //DJ Tools
menu3[0]='<?php num($menu30, '?show=djtools&do=');?>' 
menu3[1]='<?php num($menu31, '?show=djtools&do=');?>' 
menu3[2]='<?php num($menu32, '?show=djtools&do=');?>' 
menu3[3]='<?php num($menu33, '?show=djtools&do=');?>' 
menu3[4]='<?php num($menu34, '?show=djtools&do=');?>' 

var menu4=new Array() //Messaging
menu4[0]='<?php num($menu40, '?show=messaging&do=');?>' 
menu4[1]='<?php num($menu41, '?show=messaging&do=');?>' 
menu4[2]='<?php num($menu42, '?show=messaging&do=');?>' 
menu4[3]='<?php num($menu43, '?show=messaging&do=');?>' 
menu4[4]='<?php num($menu44, '?show=messaging&do=');?>' 

var menu5=new Array() //Extras
menu5[0]='<?php num($menu50, '?show=extras&do=');?>' 
menu5[1]='<?php num($menu51, '?show=extras&do=');?>' 

var menu6=new Array() //Contact
menu6[0]='<?php num($menu60, '?show=contact&do=');?>' 
menu6[1]='<?php num($menu61, '?show=contact&do=');?>' 
menu6[2]='<?php num($menu62, '?show=contact&do=');?>' 
menu6[3]='<?php num($menu63, '?show=contact&do=');?>' 
        
var menuwidth='16.6%' 
var menubgcolor='#CDCDCD;filter:alpha(opacity=95);-moz-opacity:.95;opacity:.95' 
var disappeardelay=250 
var hidemenu_onclick="yes" 

var ie4=document.all
var ns6=document.getElementById&&!document.all

if (ie4||ns6)
document.write('<div id="dropmenudiv" style="visibility:hidden;width:'+menuwidth+';background-color:'+menubgcolor+'" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>')

function getposOffset(what, offsettype){
var totaloffset=(offsettype=="right")? what.offsetLeft : what.offsetTop;
var parentEl=what.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function showhide(obj, e, visible, hidden, menuwidth){
if (ie4||ns6)
dropmenuobj.style.left=dropmenuobj.style.top="-500px"
if (menuwidth!=""){
dropmenuobj.widthobj=dropmenuobj.style
dropmenuobj.widthobj.width=menuwidth
}
if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
obj.visibility=visible
else if (e.type=="click")
obj.visibility=hidden
}

function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function clearbrowseredge(obj, whichedge){
var edgeoffset=0
if (whichedge=="leftedge"){
var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
dropmenuobj.contentmeasure=dropmenuobj.offsetWidth
if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth
}
else{
var topedge=ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset
var windowedge=ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
dropmenuobj.contentmeasure=dropmenuobj.offsetHeight
if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure){
edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight
if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure)
edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge
}
}
return edgeoffset
}

function populatemenu(what){
if (ie4||ns6)
dropmenuobj.innerHTML=what.join("")
}

function dropdownmenu(obj, e, menucontents, menuwidth){
if (window.event) event.cancelBubble=true
else if (e.stopPropagation) e.stopPropagation()
clearhidemenu()
dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv
populatemenu(menucontents)

if (ie4||ns6){
showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth)
dropmenuobj.x=getposOffset(obj, "left")
dropmenuobj.y=getposOffset(obj, "top")
dropmenuobj.style.left=dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px"
dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px"
}

return clickreturnvalue()
}

function clickreturnvalue(){
if (ie4||ns6) return false
else return true
}

function contains_ns6(a, b) {
while (b.parentNode)
if ((b = b.parentNode) == a)
return true;
return false;
}

function dynamichide(e){
if (ie4&&!dropmenuobj.contains(e.toElement))
delayhidemenu()
else if (ns6&&e.currentTarget!= e.relatedTarget&& !contains_ns6(e.currentTarget, e.relatedTarget))
delayhidemenu()
}

function hidemenu(e){
if (typeof dropmenuobj!="undefined"){
if (ie4||ns6)
dropmenuobj.style.visibility="hidden"
}
}

function delayhidemenu(){
if (ie4||ns6)
delayhide=setTimeout("hidemenu()",disappeardelay)
}

function clearhidemenu(){
if (typeof delayhide!="undefined")
clearTimeout(delayhide)
}

if (hidemenu_onclick=="yes")
document.onclick=hidemenu
</script>

I've setup a demo account which can be accessed at the URL below, all you need to do is login and then click the "User CP" button when it asks what panel you want to use. The menu I'm talking about is the one in the User CP that is along the top (horizontally) and has links such as "Radio", "Chat", "DJ Tools", "Messaging", etc.

URL: http://quickscriptz.ca/djpanel4/
User: DD-Demo
Pass: password

Any help is greatly appreciated! Thanks!

P.S. I'm not sure if the errors is happening in FF but it is definitely a problem in IE 6.

[QuickScriptz]

Update: I've tried it and the error still happens in Maxthon (which uses the IE6 rendering engine).