var isActive = false;

function menuItem(url,text){
  this.url = url;
  this.text = text;
}

function showMenu(){
  isActive = true;
  document.getElementById("ctl00$ContentPlaceHolder1$ddlCenter").style.visibility="hidden";
  document.getElementById("categoryid").style.visibility="hidden";
}

function hideMenu(){
  isActive = false;
  setTimeout('hide()',100);
}

function hide(){
  if(!isActive){
  document.getElementById("ctl00$ContentPlaceHolder1$ddlCenter").style.visibility="visible";
  document.getElementById("categoryid").style.visibility="visible";
  }
}