setupDropDown = function() {
    dropDown = document.getElementById("dropdown");
    navRoot = dropDown.getElementsByClassName('map')[0];
    for (i=0; i < navRoot.childNodes.length; i++) {
        node = navRoot.childNodes[i];
        if (node.nodeName == "LI") {
            node.onmouseover = function() {
                this.className ="over";
            }
            node.onmouseout = function() {
                this.className=this.className.replace("over", "");
            }
        }
    }
}
//onloadRegister(setupDropDown);