Hello,
I'm stuck and would like some help. I have a horizontal tab structure with subtabs. Right now the main tabs are activated onclick and they show their respective subtabs. I would like to add the same functionality to the subtabs so that when they are clicked, the style changes and the clicked subtab shows as active. I would also like to have the cookies applied to the subtabs and subtab contents as well. Can anyone please help?

Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<title>Untitled Document</title> 
<style type="text/css"> 
body{ 
font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif; 
margin-top:0px; 

} 
.bodyText{ 
padding-left:10px; 
padding-right:10px; 
border-top:1px solid #000000; 
} 
.bodyText p{ 
margin-top:5px; 
} 
#mainContainer{ 
width:760px; 
height:600px; 
border:1px solid #000000; 
margin:0 auto; 
background-image:url('../../images/heading3.gif'); 
background-repeat:no-repeat; 
padding-top:85px; 
} 
#mainMenu{ 
background-color: #FFF;/* Background color of main menu */ 
font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;/* Fonts of main menu items */ 
font-size:0.9em;/* Font size of main menu items */ 
border-bottom:1px solid #000000;/* Bottom border of main menu */ 
height:30px;/* Height of main menu */ 

position:relative;/* Don't change this position attribute */ 

} 
#mainMenu a{ 
padding-left:5px;/* Spaces at the left of main menu items */ 
padding-right:5px;/* Spaces at the right of main menu items */ 
font-weight:bold; 
/* Don't change these two options */ 
position:absolute; 
bottom:-1px;/* Change this value to -2px if you're not using a strict doctype */ 
} 
#submenu{ 
font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;/* Font of sub menu items */ 
background-color:#E2EBED;/* Background color of sub menu items */ 

width:100%;/* Don't change this option */ 

} 
#submenu div{ 
white-space:nowrap;/* Don't change this option */ 

} 
/* 
Style attributes of active menu item 
*/ 
#mainMenu .activeMenuItem{ 
/* Border options */ 
border-left:1px solid #000000; 
border-top:1px solid #000000; 
border-right:1px solid #000000; 
background-color: #E2EBED;/* Background color */ 

cursor:pointer; 
} 

#mainMenu .activeMenuItem img{ 
position:absolute; 
bottom:0px; 
right:0px; 
} 

#mainMenu .inactiveMenuItem{ 
color: #000; 
cursor:pointer; 
} 

#submenu a{ 
text-decoration:none; 
padding-left:5px; 
padding-right:5px; 
color: #000; 
font-size:0.9em; 
} 

#submenu a:hover{ 
color: #FF0000;/* Red color when the user moves the mouse over sub menu items */ 
} 

</style> 
<script type="text/javascript"> 

var menuAlignment = 'left';// Align menu to the left or right? 
var topMenuSpacer = 0; // Horizontal space(pixels) between the main menu items 
var activateSubOnClick = false; // if true-> Show sub menu items on click, if false, show submenu items onmouseover 
var leftAlignSubItems = false; // left align sub items t 

var activeMenuItem = false;// Don't change this option. It should initially be false 
var activeTabIndex = 0;// Index of initial active tab(0 = first tab) - If the value below is set to true, it will override this one. 
var rememberActiveTabByCookie = true;// Set it to true if you want to be able to save active tab as cookie 

var MSIE = navigator.userAgent.indexOf('MSIE')>=0?true:false; 
var Opera = navigator.userAgent.indexOf('Opera')>=0?true:false; 
var navigatorVersion = navigator.appVersion.replace(/.*?MSIE ([0-9]\.[0-9]).*/g,'$1')/1; 

function Get_Cookie(name) { 
var start = document.cookie.indexOf(name+"="); 
var len = start+name.length+1; 
if ((!start) && (name != document.cookie.substring(0,name.length))) return null; 
if (start == -1) return null; 
var end = document.cookie.indexOf(";",len); 
if (end == -1) end = document.cookie.length; 
return unescape(document.cookie.substring(len,end)); 
} 
// This function has been slightly modified 
function Set_Cookie(name,value,expires,path,domain,secure) { 
expires = expires * 60*60*24*1000; 
var today = new Date(); 
var expires_date = new Date( today.getTime() + (expires) ); 
var cookieString = name + "=" +escape(value) + 
( (expires) ? ";expires=" + expires_date.toGMTString() : "") + 
( (path) ? ";path=" + path : "") + 
( (domain) ? ";domain=" + domain : "") + 
( (secure) ? ";secure" : ""); 
document.cookie = cookieString; 
} 

function showHide() 
{ 
if(activeMenuItem){ 
activeMenuItem.className = 'inactiveMenuItem'; 
var theId = activeMenuItem.id.replace(/[^0-9]/g,''); 
document.getElementById('submenu_'+theId).style.di splay='none'; 
var img = activeMenuItem.getElementsByTagName('IMG'); 
if(img.length>0)img[0].style.display='none'; 
} 

var img = this.getElementsByTagName('IMG'); 
if(img.length>0)img[0].style.display='inline'; 

activeMenuItem = this; 
this.className = 'activeMenuItem'; 
var theId = this.id.replace(/[^0-9]/g,''); 
document.getElementById('submenu_'+theId).style.di splay='block'; 

if(rememberActiveTabByCookie){ 
Set_Cookie('dhtmlgoodies_tab_menu_tabIndex','index : ' + (theId-1),100); 
} 
} 

function initMenu() 
{ 
var mainMenuObj = document.getElementById('mainMenu'); 
var menuItems = mainMenuObj.getElementsByTagName('A'); 
if(document.all){ 
mainMenuObj.style.visibility = 'hidden'; 
document.getElementById('submenu').style.visibilit y='hidden'; 
} 
if(rememberActiveTabByCookie){ 
var cookieValue = Get_Cookie('dhtmlgoodies_tab_menu_tabIndex') + ''; 
cookieValue = cookieValue.replace(/[^0-9]/g,''); 
if(cookieValue.length>0 && cookieValue<menuItems.length){ 
activeTabIndex = cookieValue/1; 
} 
} 

var currentLeftPos = 15; 
for(var no=0;no<menuItems.length;no++){ 
if(activateSubOnClick)menuItems[no].onclick = showHide; else menuItems[no].onmouseover = showHide; 
menuItems[no].id = 'mainMenuItem' + (no+1); 
if(menuAlignment=='left') 
menuItems[no].style.left = currentLeftPos + 'px'; 
else 
menuItems[no].style.right = currentLeftPos + 'px'; 
currentLeftPos = currentLeftPos + menuItems[no].offsetWidth + topMenuSpacer; 

var img = menuItems[no].getElementsByTagName('IMG'); 
if(img.length>0){ 
img[0].style.display='none'; 
if(MSIE && !Opera && navigatorVersion<7){ 
img[0].style.bottom = '-1px'; 
img[0].style.right = '-1px'; 
} 
} 

if(no==activeTabIndex){ 
menuItems[no].className='activeMenuItem'; 
activeMenuItem = menuItems[no]; 
var img = activeMenuItem.getElementsByTagName('IMG'); 
if(img.length>0)img[0].style.display='inline'; 

}else menuItems[no].className='inactiveMenuItem'; 
if(!document.all)menuItems[no].style.bottom = '-1px'; 
if(MSIE && navigatorVersion < 6)menuItems[no].style.bottom = '-2px'; 

} 

var mainMenuLinks = mainMenuObj.getElementsByTagName('A'); 

var subCounter = 1; 
var parentWidth = mainMenuObj.offsetWidth; 
while(document.getElementById('submenu_' + subCounter)){ 

var subItem = document.getElementById('submenu_' + subCounter); 

if(leftAlignSubItems){ 
// No action 
}else{ 
var leftPos = mainMenuLinks[subCounter-1].offsetLeft; 
document.getElementById('submenu_'+subCounter).sty le.paddingLeft = leftPos + 'px'; 
subItem.style.position ='absolute'; 
if(subItem.offsetWidth > parentWidth){ 
leftPos = leftPos - Math.max(0,subItem.offsetWidth-parentWidth); 
} 
subItem.style.paddingLeft = leftPos + 'px'; 
subItem.style.position ='static'; 

} 
if(subCounter==(activeTabIndex+1)){ 
subItem.style.display='block'; 
}else{ 
subItem.style.display='none'; 
} 

subCounter++; 
} 
if(document.all){ 
mainMenuObj.style.visibility = 'visible'; 
document.getElementById('submenu').style.visibilit y='visible'; 
} 
document.getElementById('submenu').style.display=' block'; 
} 
window.onload = initMenu; 
</script> 
</head> 
<body> 
<!-- This is the start of the menu --> 
<div id="mainMenu"> 
<a>Products</a> <a>Support</a> <a>About us</a> <a>Download</a> 
</div> 
<div id="submenu"> 
<!-- The first sub menu --> 
<div id="submenu_1"> 
<a href="javascript:void(0);">Product 1</a> <a href="javascript:void(0);">Product 2</a> <a href="javascript:void(0);">Product 3</a> 
</div> 
<!-- Second sub menu --> 
<div id="submenu_2"> 
<a href="javascript:void(0);">Phone</a> <a href="javascript:void(0);">Email</a> <a href="javascript:void(0);">Knowledge base</a> 
</div> 
<!-- Third sub menu --> 
<div id="submenu_3"> 
<a href="javascript:void(0);">History</a> <a href="javascript:void(0);">The team</a> <a href="javascript:void(0);">Contact us</a> <a href="javascript:void(0);">Visions</a> 
</div> 
<!-- Fourth sub menu --> 
<div id="submenu_4"> 
<a href="javascript:void(0);">Patches</a> <a href="javascript:void(0);">Whitepapers</a> <a href="javascript:void(0);">Tab menu</a> <a href="javascript:void(0);">Color picker</a> <a href="javascript:void(0);">Window scripts</a> <a href="javascript:void(0);">Games</a> 
</div> 
</div> 
</body> 
</html>