function GetCookie(name) {
   if (document.cookie.indexOf(name+"=") != -1) return true;
   return false;
}
function SetCookie (name, value) {
   document.cookie=name+"="+escape(value);
   alert(document.cookie);
}
function usertrack(cookie) {
   usertrack2(cookie,(new Date()).getTime()+'_'+Math.random());
}
function usertrack2(cookie,str) {
   if (GetCookie(cookie)) return false;
   SetCookie(cookie,str);
   return true;
}