startList = function() {
    var menu = document.getElementById("topNavi");
    if (!menu)
        return;

    var nodes = document.getElementById("topNavi").getElementsByTagName("li");
    for (var i = 0; i < nodes.length; i++) {
        nodes[i].onmouseover = function() {
            this.className += " over";
        }
        nodes[i].onmouseout = function() {
            this.className = this.className.replace(new RegExp(" over\\b"), "");
        }
    }
}
if (window.attachEvent) window.attachEvent("onload", startList);