addEvent(window,'load',menu,false);

function menu()
{
    activateMenu('nav');    
}

activateMenu = function(nav)
{
    var navroot = document.getElementById(nav);
    
    var lis=navroot.getElementsByTagName("LI");
    
    for (i=0; i<lis.length; i++)
    {
        var uls = lis[i].childNodes;
        
        for (c=0; c<uls.length; c++)
        {
            if (uls[c].tagName=="UL")
            {
                lis[i].className+=" sub";
            }
        }
        
        if (document.all && document.getElementById(nav).currentStyle)
        {  
            lis[i].onmouseover=function()
            {    
               this.className+=" over";
            }
            lis[i].onmouseout=function()
            {                       
               this.className=this.className.replace(" over", "");
            }
        }

    }
}