function menujs() {
    var element = 'home-nav';
    var menu = document.getElementById(element);
    if (!menu) {
        alert('nie ma elementu!');
    }
    var li = menu.getElementsByTagName('li');
    for (i = 0; i < li.length; i++) {
        li[i].onmouseover = function () {this.className += 'hover';};
        li[i].onmouseout = function () {this.className = this.className.replace(/hover/, '');};
    }
}