It tells you on that link where to put the code, just to clarify...
Put this in the <head> tag:
<head>
<style type="text/css">
#dropmenudiv{
position:absolute;
background-color: #E3FFB0;
border:1px solid black;
border-bottom-width: 0;
font:normal 12px Verdana;
line-height:18px;
z-index:100;
}
#dropmenudiv a{
width: 100%;
display: block;
text-indent: 3px;
border-bottom: 1px solid black;
padding: 1px 0;
text-decoration: none;
font-weight: bold;
}
#dropmenudiv a:hover{ /*hover background color*/
background-color: #C7FF5E;
}
/* Sample CSS definition for the example list. Remove if desired */
.navlist li {
list-style-type: square;
width: 135px;
background-color: #FFFFB9;
}
</style>
<script type="text/javascript">
/***********************************************
* AnyLink Vertical Menu- © Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/
//Contents for menu 1
var menu1=new Array()
menu1[0]='<a href="http://www.javascriptkit.com">JavaScript Kit</a>'
menu1[1]='<a href="http://www.freewarejava.com">Freewarejava.com</a>'
menu1[2]='<a href="http://codingforums.com">Coding Forums</a>'
menu1[3]='<a href="http://www.cssdrive.com">CSS Drive</a>'
menu1[4]='<a href="http://tools.dynamicdrive.com/imageoptimizer/">Image Optimizer</a>'
//Contents for menu 2, and so on
var menu2=new Array()
menu2[0]='<a href="http://www.javascriptkit.com/cutpastejava.shtml">Free JavaScripts</a>'
menu2[1]='<a href="http://www.javascriptkit.com/javaindex.shtml">JavaScript tutorials</a>'
menu2[2]='<a href="http://news.bbc.co.uk">JavaScript Reference</a>'
menu2[4]='<a href="http://www.javascriptkit.com/java/">Java Applets</a>'
menu2[3]='<a href="http://www.javascriptkit.com/dhtmltutors/">DHTML & CSS</a>'
menu2[4]='<a href="http://www.javascriptkit.com/howto/">Design Tutorials</a>'
var disappeardelay=250 //menu disappear speed onMouseout (in miliseconds)
var horizontaloffset=2 //horizontal offset of menu from default location. (0-5 is a good value)
/////No further editting needed
var ie4=document.all
var ns6=document.getElementById&&!document.all
if (ie4||ns6)
document.write('<div id="dropmenudiv" style="visibility:hidden;width: 160px" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>')
function getposOffset(what, offsettype){
var totaloffset=(offsettype=="left")? 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=-500
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=="rightedge"){
var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
dropmenuobj.contentmeasure=dropmenuobj.offsetWidth
if (windowedge-dropmenuobj.x-obj.offsetWidth < 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){ //move menu up?
edgeoffset=dropmenuobj.contentmeasure-obj.offsetHeight
if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either? (position at top of viewable window then)
edgeoffset=dropmenuobj.y
}
}
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")+obj.offsetWidth+horizontaloffset+"px"
dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+"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)
}
</script>
</head>
Then you'd put this in the <body> tag:
<body>
<a href="default.htm" onMouseover="dropdownmenu(this, event, menu1, '165px')" onMouseout="delayhidemenu()">Webmaster Links</a><br />
<!-- Activate menu onclick instead
<a href="default.htm" onClick="return dropdownmenu(this, event, menu1, '165px')" onMouseout="delayhidemenu()">Webmaster Links</a><br />
-->
<ul class="navlist">
<li><a href="http://www.dynamicdrive.com">Dynamic Drive</a></li>
<li onMouseover="dropdownmenu(this, event, menu2, '150px')" onMouseout="delayhidemenu()"><a href="http://www.javascriptkit.com">JavaScript Kit</a> <span style="position: relative; left: 30px">></span></li>
<li><a href="http://www.cssdrive.com">CSS Drive</a></li>
<li><a href="http://www.codingforums.com">Coding Forums</a></li>
</ul>
</body>
Simple as that really... of course it doesn't look like what they have on the site you've mentioned, but it can be easily achieved with a few modifications to the CSS, changing colours, heights, widths etc...