Pour utiliser la fonction de renvoi automatique, il faut avoir créé le "cookie" avec la fonction suivante. Si vous faites appel à des fenêtres multiples (frames), vous le mettez dans le fichier qui crée les fenêtres.

<script language="javascript">
<!-- begin script
//  Following functions written by:  Bill Dortch, hIdaho Design <bdortch@hidaho.com>
//  The following functions are released to the public domain.

function FixCookieDate (date) {
  var base = new Date(0);
  var skew = base.getTime(); // dawn of (Unix) time - should be 0
  if (skew > 0)  // Except on the Mac - ahead of its time
    date.setTime (date.getTime() - skew);
}

function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
      return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break; 
  }
  return null;
}

function SetCookie (name, value) {
  var argv = SetCookie.arguments;
  var argc = SetCookie.arguments.length;
  var expires = (argc > 2) ? argv[2] : null;
  var path = (argc > 3) ? argv[3] : null;
  var domain = (argc > 4) ? argv[4] : null;
  var secure = (argc > 5) ? argv[5] : false;
  if (expires!=null) FixCookieDate(expires); //*** Uncomment this line for automatic date correction (see above)
  document.cookie = name + "=" + escape (value) +
    ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
    ((path == null) ? "" : ("; path=" + path)) +
    ((domain == null) ? "" : ("; domain=" + domain)) +
    ((secure == true) ? "; secure" : "");
}

//  Following functions written by:  Martin Beaudoin, University of Alberta <mbeaudoi@gpu.srv.ualberta.ca>
//  The following functions are released to the public domain.


function MakeCookieLastFileVisited (){        //records the location of last file visited in site
 	var expdate = new Date ();
 	addr = document.location;
	expdate.setTime (expdate.getTime() + (1000 * 24 * 60 * 60 * 1000)); // 1000 days from now (mod Mac bug)
	SetCookie ("derniere", addr, expdate, "/");
}
// end script -->
</script>