var menuids=["treemenu1"];

function buildsubmenus_horizontal () {
    for (var i=0; i<menuids.length; i++) {
        var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul");
        for (var t=0; t<ultags.length; t++) {
            if (ultags[t].parentNode.parentNode.id==menuids[i]) {
                ultags[t].style.top=ultags[t].parentNode.offsetHeight+"px";
                ultags[t].parentNode.getElementsByTagName("a")[0].className="mainfoldericon";
            } else {
                ultags[t].style.left=ultags[t-1].getElementsByTagName("a")[0].offsetWidth+"px";
                ultags[t].parentNode.getElementsByTagName("a")[0].className="subfoldericon";
            }
            ultags[t].parentNode.onmouseover=function() {
                this.getElementsByTagName("ul")[0].style.visibility="visible";
            }
            ultags[t].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);
}