function setCookie(tName, tValue)
{
      expired = new Date();
      expired.setTime(expired.getTime() + (24*60*60*1000000));
      document.cookie= tName + '=' + escape(tValue) +';expires = '+ expired.toGMTString();
}
                       
function getCookie(tName)
{
  var dc = document.cookie;
  var prefix = tName + '=';
  var begin = dc.indexOf('; ' + prefix);
                           
      if (begin == -1){
          begin = dc.indexOf(prefix);
          if (begin != 0) return null;
          } else {
          begin += 2;
          }
    
  var end = document.cookie.indexOf(';', begin);
                       
      if (end == -1){
          end = dc.length;
      }
      return unescape(dc.substring(begin + prefix.length, end));
}