function getCookie(name) 
{
  var dc = document.cookie;
  var prefix = name + "=";
  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));
}