// bevat code op cookies te lezen/schrijven

function GetCookie(NameOfCookie)
    {
    if (document.cookie.length > 0) 
       {              
       begin = document.cookie.indexOf(NameOfCookie+"=");       
       if (begin != -1) 
         {           
         begin += NameOfCookie.length+1;       
         end = document.cookie.indexOf(";", begin);
         if (end == -1) end = document.cookie.length;
         return unescape(document.cookie.substring(begin, end));
         } 
       }
  return null;
    }

function SetCookie(NameOfCookie, value, expiredays) 
   {
   var ExpireDate = new Date();

   ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));

   document.cookie = NameOfCookie + "=" + escape(value) + 
   ((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
   }

function DelCookie (NameOfCookie) 
   {
   if (GetCookie(NameOfCookie)) {document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";}
   }