[F8] Multiple Scrollbars in one Movie Clip?

I need two scrollbars within one movieclip. For some weird reason I can only get one to work. I've tried renaming my mc's instance names to be different but it still doesn't work with different names. In the attached example the instance names are the same but housed in different mcs. The type of scrollbar I'm using also only works when you publish with a flash player 6.... something about a mac....

Anyway, if someone could tell me what I need to do differently I'd really appreciate it. I've attached the file for reference.

Appreciate the help!

It's because you're using

MovieClip.prototype.scrollEase.

If you set this twice, the second overrides the first, hence the reason why both scrollbars scroll the second movieclip. Instead of using the prototype, use a normal function, passing the mc as a variable.