Strange, it works on my pc with this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
.sidebarmenu ul{
margin: 0;
padding: 0;
list-style-type: none;
font: bold 13px Verdana;
width: 160px; /* Main Menu Item widths */
border-bottom: 1px solid #ccc;
z-index:1;
}
.sidebarmenu ul li{
position: relative;
}
/* Top level menu links style */
.sidebarmenu ul li a{
display: block;
overflow: auto; /*force hasLayout in IE7 */
color: #ef7f01;
text-decoration: none;
padding: 6px;
border-bottom: 1px solid #778;
}
.sidebarmenu ul li a:link, .sidebarmenu ul li a:visited, .sidebarmenu ul li a:active{
background-color: blue; /*background of tabs (default state)*/
}
.sidebarmenu ul li a:visited{
color: #ef7f01;
}
.sidebarmenu ul li a:hover{
background-color: #EEE;
}
/*Sub level menu items */
.sidebarmenu ul li ul{
position: absolute;
width: 170px; /*Sub Menu Items width */
top: 0;
visibility: hidden;
z-index:100;
}
.sidebarmenu a.subfolderstyle{
background: url(right.gif) no-repeat 97% 50%;
}
/* Holly Hack for IE \*/
* html .sidebarmenu ul li { float: left; height: 1%; }
* html .sidebarmenu ul li a { height: 1%; }
/* End */
</style>
<script type="text/javascript">
//Nested Side Bar Menu (Mar 20th, 09)
//By Dynamic Drive: http://www.dynamicdrive.com/style/
var menuids=["sidebarmenu1","sidebarmenu2","sidebarmenu3","sidebarmenu4"] //Enter id(s) of each Side Bar Menu's main UL, separated by commas
function initsidebarmenu(){
for (var i=0; i<menuids.length; i++){
var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul")
for (var t=0; t<ultags.length; t++){
ultags[t].parentNode.getElementsByTagName("a")[0].className+=" subfolderstyle"
if (ultags[t].parentNode.parentNode.id==menuids[i]) //if this is a first level submenu
ultags[t].style.left=ultags[t].parentNode.offsetWidth+"px" //dynamically position first level submenus to be width of main menu item
else //else if this is a sub level submenu (ul)
ultags[t].style.left=ultags[t-1].getElementsByTagName("a")[0].offsetWidth+"px" //position menu to the right of menu item that activated it
ultags[t].parentNode.onmouseover=function(){
this.getElementsByTagName("ul")[0].style.display="block"
}
ultags[t].parentNode.onmouseout=function(){
this.getElementsByTagName("ul")[0].style.display="none"
}
}
for (var t=ultags.length-1; t>-1; t--){ //loop through all sub menus again, and use "display:none" to hide menus (to prevent possible page scrollbars
ultags[t].style.visibility="visible"
ultags[t].style.display="none"
}
}
}
if (window.addEventListener)
window.addEventListener("load", initsidebarmenu, false)
else if (window.attachEvent)
window.attachEvent("onload", initsidebarmenu)
</script>
</head>
<body>
<table id="mainTable" width="740" border="1" cellspacing="0">
<tr>
<td>
<div class="sidebarmenu">
<!-- Liens de la première colonne -->
<ul id="sidebarmenu1">
<li><a href="#">Pqsdfqsdfoms</a></li>
<li><a href="#">sddsfsdf</a></li>
<li><a href="#">sdqsdqDy</a>
<ul>
<li><a href="#">qsdQSDe</a></li>
<li><a href="#">VQSDFQSDF</a></li>
<li><a href="#">PubQSort</a></li>
<li><a href="#">QDoling</a></li>
<li><a href="#">Parqdg</a></li>
</ul>
</li>
<li><a href="#" target="_blank">BFGDSDFG</a></li>
<li><a href="#" target="_blank">QQsdQSDs</a></li>
<li><a href="#" target="_blank">qsdfqsfd</a></li>
</ul>
</div>
</td>
<td VALIGN="top">
<!-- Liens de la deuxième colonne -->
<div class="sidebarmenu">
<ul id="sidebarmenu2" >
<li><a href="#">Pqsdfqsdfoms</a></li>
<li><a href="#">sddsfsdf</a></li>
<li><a href="#">sdqsdqDy</a>
<ul>
<li><a href="#">qsdQSDe</a></li>
<li><a href="#">VQSDFQSDF</a></li>
<li><a href="#">PubQSort</a></li>
<li><a href="#">QDoling</a></li>
<li><a href="#">Parqdg</a></li>
</ul>
</li>
<li><a href="#" target="_blank">BFGDSDFG</a></li>
<li><a href="#" target="_blank">QQsdQSDs</a></li>
<li><a href="#" target="_blank">qsdfqsfd</a></li>
</ul>
</div>
</td>
<td VALIGN="top">
<!-- Liens de la troisième colonne -->
<div class="sidebarmenu">
<ul id="sidebarmenu3">
<li><a href="#menu4">Travel Booking</a>
<ul>
<li><a href="#">Intro</a></li>
<li><a href="#">Policy</a></li>
<li><a href="#">zthz</a></li>
<li><a href="#">hrzehr</a></li>
</ul>
</li>
<li><a href="#menu4">qdgqfgqfgqg</a></li>
<li><a href="#menu4">qsgqsdqsg</a>
<ul>
<li><a href="#">qgsqgq</a></li>
<li><a href="#">qsd</a>
<!--<ul>
<li><a href="#">Travel Expenses</a></li>
<li><a href="#">Admissible Expenses</a></li>
<li><a href="#">Compensation rules</a></li>
</ul>-->
</li>
<li><a href="#">qsdfqsdf</a></li>
<li><a href="#">qsdfqsdf</a></li>
<li><a href="#">qsdfqsf</a></li>
<li><a href="#">qsdfqsdf</a></li>
</ul>
</li>
</ul>
</div>
</td>
<td class="noRightBorder" VALIGN="top">
<!-- Liens de la quatrième colonne -->
<div class="sidebarmenu">
<ul id="sidebarmenu4">
<li><a href="">qsdfqsdf</a></li>
<li><a href="" target="_blank">qsdfq</a></li>
</ul>
</div>
</td>
</tr>
</table>
</body>
</html>