function buildSiteTopMenu(){
    
    var ultags = document.getElementById("topMenu").getElementsByTagName("ul");

    for (var t=0; t<ultags.length; t++){
        if (ultags[t].parentNode.parentNode.id == "topMenu") {
            ultags[t].style.top=ultags[t].parentNode.offsetHeight + "px" 
        }
        ultags[t].parentNode.onmouseover=function(){
            this.getElementsByTagName("ul")[0].style.visibility="visible"
        }
        ultags[t].parentNode.onmouseout=function(){
            this.getElementsByTagName("ul")[0].style.visibility="hidden"
        }
    }
}