CodingForums.com - Rename file each time it is saved

This script that I'm using, on a web page, allows a web page visitor to record a video, via his webcam. However, the recording is given the same file name each time (Video), thus each new recording replaces the previous stored one. How can I add code that will give each recording a unique file name - so that all recordings are saved/stored?

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">

        <head>

                <title>recorder</title>

                <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

                <script type="text/javascript" src="js/swfobject.js"></script>

        </head>



        <body bgcolor="#ffffff">

                <div id="recorder"></div>





              <script type="text/javascript">

               // <![CDATA[

               var so = new SWFObject("recorder.swf", "recorder", "620", "470", "9", "#000000");

                           so.addParam('flashvars','filename=Video&rtmpPath=rtmp://67.xxx.xxx.xxx/vid/&finishURL=player.html')

               so.write("recorder");

               // ]]>

               </script>

</body>

</html>