function Menu(){
    var childnodes;
    try{
        childnodes = $('mainnav').getElementsByTagName('li');
    }
    catch (e){
        //alert(e);
    }
    for(var i=0; i<childnodes.length; i++){
        var ulList = childnodes[i].getElementsByTagName('ul');
        if (ulList.length > 0){
            var ul = ulList[0];
            var ulWidth = $(ul).getWidth() + 'px';
            var liList = ul.getElementsByTagName('li');
           
            for(var i=0; i<liList.length; i++){
                var li = liList[i];
                li.style.width = ulWidth;
            }
            //ul.onmouseover = function(){HighLight(this,str)};
        }
    }
}