function prepareMainMenu() {
    var menu = document.getElementById('nav');
    var tags_a;
    if (_wm_s != '')
        var active = document.getElementById('wm_' + _wm_s);
    else
        var active = document.getElementById('wm_' + _wm);


    
    if (menu) {
        tags_a = menu.getElementsByTagName('A');
        if (tags_a) {
            for (i = 0; i < tags_a.length; i++) {
                if (tags_a[i].parentNode.childNodes[2]) {

                    tags_a[i].parentNode.childNodes[0].onclick = function() { if (this.parentNode.childNodes[2].style.display == 'block') this.parentNode.childNodes[2].style.display = 'none'; else this.parentNode.childNodes[2].style.display = 'block'; return false; }
                }

            }
        }
    
        //var items = menu.getElementsByTagName('li');
        var items = menu.childNodes;
        for (i = 0; i < items.length; i++) {

            if (items[i].childNodes[2]) {
                
                if (active  && active.parentNode.parentNode.parentNode == items[i])
                    items[i].childNodes[2].style.display = 'block';
                else
                    if (active && active.parentNode.parentNode.parentNode.parentNode.parentNode == items[i]) {
                            items[i].childNodes[2].style.display = 'block';
                            //if (items[i].childNodes[2]==active)
                            //alert(items[i].childNodes[2].nodeName + '-' + active.parentNode.parentNode.nodeName);
                            active.parentNode.parentNode.style.display = 'block';
                        //items[i].childNodes[2].childNodes[2].style.display = 'block';

                    }
                    else
                        items[i].childNodes[2].style.display = 'none';

         //       items[i].childNodes[0].onclick = function() {if (this.parentNode.childNodes[2].style.display == 'block') this.parentNode.childNodes[2].style.display = 'none'; else this.parentNode.childNodes[2].style.display = 'block'; return false; }
            }
        }
    }
    
}
//addEventoOnLoad(prepareMainMenu);
//prepareMainMenu();