function SetCookie (name, value) {
  var expDays = 30;
  var exp = new Date(); 
  exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
  expirationDate = exp.toGMTString();
  document.cookie = name + "=" + escape(value)
  document.cookie += "; expires=" + expirationDate;
}