var timer,i,menuId;

var dom = document.getElementById ? true : false;
var ie4 = ((document.all) && (!dom)) ? true : false;
var ns4 = document.layers ? true : false;
var opera = navigator.userAgent.indexOf('Opera') != -1 ? true : false;
var dhtml = dom ? true : ie4 ? true : ns4 ? true : false;

if(dhtml) document.write ('<style type="text/css">#scriptSupport {display:none;} #menuHolder {position:relative; visibility:hidden; z-index:1;} #hiddenMenu1 {position:absolute; visibility:hidden; left:2px; top:10px;} #visibleMenu1 {position:absolute; left:0px; top:-8px;}</style>');

function setVisibility(element,newVisibility){ 
  if(dhtml){
    if (dom) document.getElementById(element).style.visibility = newVisibility;
    else if (ie4) document.all[element].style.visibility = newVisibility;
    else if (ns4) eval('document.' + element + '.visibility = newVisibility');
  }
}

function menu(){
  if(dhtml){
    if (opera) for (i = 1; i <= 1; i++) document.getElementById('hiddenMenu' + i).style.top = 20;
    if (ie4) for (i = 1; i <= 1; i++) document.all['hiddenMenu' + i].style.top = 18;
    setVisibility('menuHolder','visible');
  }
}

function showMenu(id){
  if(dhtml){
    clearTimeout(timer);
    for (i = 1; i <= 1; i++) if (i != id) setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + i,'hidden');
    setVisibility((ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id,'visible');
  }
}

function hideMenu(id){
  if(dhtml){
    menuId = (ns4 ? 'menuHolder.document.' : '') + 'hiddenMenu' + id;
    timer = setTimeout("setVisibility(menuId,'hidden')",50);
  }
}

function dontHideMenu(){
  if(dhtml) clearTimeout(timer);
}