function insertGuestLink(linkText)
{
  var linkFile
  var thisFile

  if (linkText=="current")
    linkFile="index.html"
  else
    linkFile="guestbook_"+linkText+".html"
  thisFile=window.location.pathname.substring(window.location.pathname.lastIndexOf("/")+1,window.location.pathname.length)
  if ((linkFile==thisFile)||((thisFile=="")&&(linkFile=="index.html")))
    document.write(linkText)
  else
    document.write('<A HREF="/guestbook/'+linkFile+'">'+linkText+'</A>')
}