/* CONFIG */
menuClassName = "menuNavigazione";
/* SCRIPT */
function closeSub(menu) {
for (var i=0; i<menu.childNodes.length; i++)
if (menu.childNodes[i].nodeName.toLowerCase()=="li") {
li = menu.childNodes[i];
li.onmouseover = li.onactivate = li.onfocus = function() { if (this.subMenu) this.subMenu.className = this.subMenu.className.replace(/subMenu-off/g,"subMenu-on") };
li.onmouseout = li.ondeactivate = li.onblur = function() { if (this.subMenu) closeSub(this.subMenu) };
for (j=0; j<li.childNodes.length; j++)
if (li.childNodes[j].nodeName.toLowerCase()=="ul" || li.childNodes[j].nodeName.toLowerCase()=="ol") closeSub(li.subMenu = li.childNodes[j]);
}
menu.className = menu.className.replace(/\s?subMenu-on/g,"")+" subMenu-off";
}
/* ON LOAD */
window.onload = function(e) {
if(tags_ = document.getElementsByTagName('ul'))
for(i=0; i<tags_.length; i++)
if (tags_[i].className==menuClassName) closeSub(tags_[i]);
if(tags_ = document.getElementsByTagName('ol'))
for(i=0; i<tags_.length; i++)
if (tags_[i].className==menuClassName) closeSub(tags_[i]);
}



_Perlomeno sarebbe l'unico motivo che a prima vista potrebbe venire in mente.. per il restom non so cosa dirti!

Ciao