Put a Loading in a ScrollPane, and using the ProgressBar component

Hi guys, I need you’re help.

I made a scrollpane here: http://www.microscience.com.pe/hb/curriculum/departments/physical/overview.htm

I don’t have any problem to made it. But the problem is that this swf have a weight of 117kb, so I need to use a loading bar or something to show before the swf load.

But I can do it, I mean I use many examples to create a loading in movie clips, but i can’t make it in a scrollpane. PLEASE HELP ME.

Other thing, does anybody have a tutorial to use the ProgressBar component of the FLASH MX.