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 ""
}