The references to the .css and .js files of the script on your page are currently both broken:
Code:
<link rel="stylesheet" type="text/css" href="popupmenu.css" />
<script type="text/javascript" src="popupmenu.js">
/***********************************************
* Flex Level Popup Menu- (c) Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for this script and 100s more
***********************************************/
</script>
Upload both files to your server into the same directory where your page resides in.
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