Foros del Web - Sombra en Menú

Amigos del foro, encontré este buen menú y quisera saber como hago para meter una sombra que se muestre al pasar por sus opciones. Este es el CSS.
Código HTML:
<style type="text/css">

.menutitle{

cursor:pointer;

margin-bottom: 5px;

background-color:#ECECFF;

color:#000000;

width:140px;

padding:2px;

text-align:center;

font-weight:bold;

/*/*/border:1px solid #000000;/* */

}
 

.submenu{

margin-bottom: 0.5em;

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

/***********************************************

* Switch Menu script- by Martial B of http://getElementById.com/

* Modified by Dynamic Drive for format & NS4/IE4 compatibility

* Visit http://www.dynamicdrive.com/ for full source code

***********************************************/
 

var persistmenu="yes" //"yes" or "no". Make sure each SPAN content contains an incrementing ID starting at 1 (id="sub1", id="sub2", etc)

var persisttype="sitewide" //enter "sitewide" for menu to persist across site, "local" for this page only
 

if (document.getElementById){ //DynamicDrive.com change

document.write('<style type="text/css">\n')

document.write('.submenu{display: none;}\n')

document.write('</style>\n')

}
 

function SwitchMenu(obj){

        if(document.getElementById){

        var el = document.getElementById(obj);

        var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change

                if(el.style.display != "block"){ //DynamicDrive.com change

                        for (var i=0; i<ar.length; i++){

                                if (ar[i].className=="submenu") //DynamicDrive.com change

                                ar[i].style.display = "none";

                        }

                        el.style.display = "block";

                }else{

                        el.style.display = "none";

                }

        }

}
 

function get_cookie(Name) { 

var search = Name + "="

var returnvalue = "";

if (document.cookie.length > 0) {

offset = document.cookie.indexOf(search)

if (offset != -1) { 

offset += search.length

end = document.cookie.indexOf(";", offset);

if (end == -1) end = document.cookie.length;

returnvalue=unescape(document.cookie.substring(offset, end))

}

}

return returnvalue;

}
 

function onloadfunction(){

if (persistmenu=="yes"){

var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname

var cookievalue=get_cookie(cookiename)

if (cookievalue!="")

document.getElementById(cookievalue).style.display="block"

}

}
 

function savemenustate(){

var inc=1, blockid=""

while (document.getElementById("sub"+inc)){

if (document.getElementById("sub"+inc).style.display=="block"){

blockid="sub"+inc

break

}

inc++

}

var cookiename=(persisttype=="sitewide")? "switchmenu" : window.location.pathname

var cookievalue=(persisttype=="sitewide")? blockid+";path=/" : blockid

document.cookie=cookiename+"="+cookievalue

}
 

if (window.addEventListener)

window.addEventListener("load", onloadfunction, false)

else if (window.attachEvent)

window.attachEvent("onload", onloadfunction)

else if (document.getElementById)

window.onload=onloadfunction
 

if (persistmenu=="yes" && document.getElementById)

window.onunload=savemenustate
 
 </script>
:-)