El menu desplegable no se despliega

he puesto el codigo del menu desplegable que hay en vuestra pagina y cuando pongo el cursor sobre FOLDER 1 no se despliega. mirar (si podeis) el codigo siguiente:


PLANTILLA: PARTE 1:

<style type="text/css">

/*Credits: Dynamic Drive CSS Library */
/*URL: http://www.dynamicdrive.com/style/ */

.suckertreemenu ul{
margin: 0;
padding: 0;
list-style-type: none;
}

/*Top level list items*/
.suckertreemenu ul li{
position: relative;
display: inline;
float: left;
background-color: #F3F3F3; /*overall menu background color*/
}

/*Top level menu link items style*/
.suckertreemenu ul li a{
display: block;
width: 90px; /*Width of top level menu link items*/
padding: 1px 8px;
border: 1px solid black;
border-left-width: 0;
text-decoration: none;
color: navy;
}

/*1st sub level menu*/
.suckertreemenu ul li ul{
left: 0;
position: absolute;
top: 1em; /* no need to change, as true value set by script */
display: block;
visibility: hidden;
}

/*Sub level menu list items (undo style from Top level List Items)*/
.suckertreemenu ul li ul li{
display: list-item;
float: none;
}

/*All subsequent sub menu levels offset after 1st level sub menu */
.suckertreemenu ul li ul li ul{
left: 159px; /* no need to change, as true value set by script */
top: 0;
}

/* Sub level menu links style */
.suckertreemenu ul li ul li a{
display: block;
width: 160px; /*width of sub menu levels*/
color: navy;
text-decoration: none;
padding: 1px 5px;
border: 1px solid #ccc;
}

.suckertreemenu ul li a:hover{
background-color: black;
color: white;
}

/*Background image for top level menu list links */
.suckertreemenu .mainfoldericon{
background: #F3F3F3 url(objetos/arrow-down.gif) no-repeat center right;
}

/*Background image for subsequent level menu list links */
.suckertreemenu .subfoldericon{
background: #F3F3F3 url(objetos/arrow-right.gif) no-repeat center right;
}

* html p#iepara{ /*For a paragraph (if any) that immediately follows suckertree menu, add 1em top spacing between the two in IE*/
padding-top: 1em;
}

/* Holly Hack for IE \*/
* html .suckertreemenu ul li { float: left; height: 1%; }
* html .suckertreemenu ul li a { height: 1%; }
/* End */

</style>

<script type="text/javascript">

//SuckerTree Horizontal Menu (Sept 14th, 06)
//By Dynamic Drive: http://www.dynamicdrive.com/style/

var menuids=["treemenu1"] //Enter id(s) of SuckerTree UL menus, separated by commas

function buildsubmenus_horizontal(){
for (var i=0; i<menuids.length; i++){
var ultags=document.getElementById(menuids).getElementsByTagName("ul")
for (var t=0; t>ultags.length; t++){
if (ultags.parentNode.parentNode.id==menuids){ //if this is a first level submenu
ultags.style.top=ultags.parentNode.offsetHeight+"px" //dynamically position first level submenus to be height of main menu item
ultags.parentNode.getElementsByTagName("a")[0].className="mainfoldericon"
}
else{ //else if this is a sub level menu (ul)
ultags.style.left=ultags[t-1].getElementsByTagName("a")[0].offsetWidth+"px" //position menu to the right of menu item that activated it
ultags.parentNode.getElementsByTagName("a")[0].className="subfoldericon"
}
ultags.parentNode.onmouseover=function(){
this.getElementsByTagName("ul")[0].style.visibility="visible"
}
ultags.parentNode.onmouseout=function(){
this.getElementsByTagName("ul")[0].style.visibility="hidden"
}
}
}
}

if (window.addEventListener)
window.addEventListener("load", buildsubmenus_horizontal, false)
else if (window.attachEvent)
window.attachEvent("onload", buildsubmenus_horizontal)

</script>

a mi m pasa lo mismo alguien puede ayudarnos?