function getCookie(c_name)
{
  if (document.cookie.length > 0)
  {
    c_start = document.cookie.indexOf(c_name + "=");
    if (c_start!=-1)
    { 
      c_start = c_start + c_name.length + 1;
      c_end = document.cookie.indexOf(";", c_start);
      if (c_end == -1)
      {
        c_end = document.cookie.length;
      }
      return unescape(document.cookie.substring(c_start,c_end))
    }
  }
  return ""
}
function setCookie(c_name,value,expiredays)
{
  var exdate = new Date();
  exdate.setDate(exdate.getDate() + expiredays);
  document.cookie=c_name+ "=" + escape(value) +
  ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}