window.onload = function() {

    var navi = document.getElementById("navigation") || null;

    if (navi) {

        var arrMenuItems = navi.getElementsByTagName("LI");

        for (var i = 0; i < arrMenuItems.length; i++) {
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                arrMenuItems[i].onmouseover = function(e) {
                    if (!this.getElementsByTagName("DIV")[0]) return;
                    this.getElementsByTagName("DIV")[0].style.display = "block";
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                arrMenuItems[i].onmouseout = function(e) {
                    if (!this.getElementsByTagName("DIV")[0]) return;
                    this.getElementsByTagName("DIV")[0].style.display = "none";
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        }
    }

}