If all you need is a simple, basic and not fancy, track-progress bar that you can navigate by clicking and dragging, then I've got what you need! (check your messages to see mine, it's not a working version because you can only upload 1 file, and .mp3s and .xml have to be in same directory, but I can upload a working version somewhere if you have doubts as to how well it works!)
I just so happen to have spent all yesterday and most of today making one for my own website! So that works out for both of us, if this is all you need- it shouldn't take long for me to implement it in your code!