Javascript Finding Out if the Page Has Changed Since Your Last Visit

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This is a VERY good piece of Javascript too have on your page. Most people don't like it when they go back to a page a few days after their first visit hoping to find something new and interesting, but instead they waste their precious time in avail. The only fallback to this is that if you use an HTML editor (such as GEOCITIES's), the 'document.lastModified' will not work, thus this Javascript does not work on my page. If you FTP files, however, the 'document.lastModified' will work.

The source...

<script language="JavaScript">
<!--
// please keep these lines on when you copy the source
// made by: Nicolas - http://www.javascript-page.com

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;
  document.cookie = name + "=" + escape (value) +
    ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
    ((path == null) ? "" : ("; path=" + path)) +
    ((domain == null) ? "" : ("; domain=" + domain)) +
    ((secure == true) ? "; secure" : "");
}

function DeleteCookie(name) {
  var exp = new Date();
  FixCookieDate (exp);
  exp.setTime (exp.getTime() - 1);
  var cval = GetCookie (name);
  if (cval != null)
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var cookie_date=new Date(document.lastModified);
var expdate = new Date();
expdate.setTime(expdate.getTime()+(5*24*60*60*1000));

document.write("This page last updated on: "+document.lastModified);
document.write("<br>");
if (!(cookie_date == GetCookie("cookie_date"))){
  SetCookie("cookie_date",cookie_date,expdate);
  document.write("<font color='blue'>This page has changed since your last visit!</font><br>");
}
//-->

</script>

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