Did you try at the JW player site? The answer is probably there if you poke around.

Using the wizard...

http://www.jeroenwijering.com/?page=wizard

maybe the syntax is more of something like this?

so.addParam('flashvars','&file=/upload/flash.flv&title=video_info.title');

I have no idea but you might want to start there, at the site where the player comes from...they have a forum so maybe ask over there.