Add A Video From Code Behind?

m using a JW player with the following code

<script type='text/javascript'>
//var file_link = this.Label2.Text;
var so = new SWFObject('http://player.longtailvideo.com/player4.6.swf','ply','470','320','9','#000000');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','http://www.youtube.com/v/S2HIda5wSVU&fs=1');
so.write('mediaspace');
</script>

Now I have some video links in a gridview so I just want to be able to load the video depending on what the user selects from the gridview..i.e. m using gridview as a playlist..so can somebody tell me how to load the video in the above code from code behind.