function SetCookie(cookieName, value) {
   var expires = new Date();
   expires.setTime(expires.getTime() + 2592000000);
   document.cookie = cookieName + "=" + escape(value) + "; expires=" + expires.toGMTString();
}

function GetCookie(cookieName) {
   var alen = cookieName.length;
   var clen = document.cookie.length;
   var i = 0;
   while (i < clen) {
      var j = i + alen;
      if(document.cookie.substring(i, j) == cookieName) {
         var endstr = document.cookie.indexOf (";", j);
         if (endstr == -1)
            endstr = document.cookie.length;
         return unescape(document.cookie.substring(j + 1, endstr));
      }
      i = document.cookie.indexOf(" ", i) + 1;
      if (i == 0) break;
   }
   return null;
}