At the bottom of many pages (this one for example) you may have seen a revision date. You can use a neat bit of JavaScript to revise this date automatically. To produce your automatic date, cut and paste the following code (courtesy of Cranial Software) into your HTML document:

<SCRIPT LANGUAGE="JavaScript">
<!--//hide script from old browsers
document.write( "<I>Last updated "+ document.lastModified +"</I>");
//end hiding contents -->
</SCRIPT>