[Plugin: WP Supersized] PlayToggle not working

Hello,

I use the navigation panel for my Supersized plugin and the play/pause button won’t work. It actually stays stuck on the “pause” image whenever I click it, and the only thing it does is making the progress bar jump back to the start. I’ve tried checking the .js files but I’m terrible at Javascript.
Any idea about what could be wrong ?

Thanks,

Claire

http://wordpress.org/extend/plugins/wp-supersized/