Subtitle option during video upload process (clipbucket)

We are looking to add the possibility for our users to add/upload a subtitle during the video upload process on our website. We are using clipbucket script. The subtitle need to be store into a folder on our server, or be linked from a remote adress. It need to have his own identification, and need to be linked with the video informations into the mysql database. Also we use Jw player 5, and the subtitle if he exist need to being played with the linked video. The format of the subtitle need to fit the both format used by Jw player 5. Here you can find Clipbucket script (avaible freely), if you need for information (we just have made some minor changes to it, so everything working for it should work for us) : [login to view URL] If you need more informations, feel free to ask.