redefining button area

[mahlok]

I have a button that plays a movie clip on loading. The clip just moves an object across the screen. After it's done, the click area for the button is still defined by the beginning of the clip, which is no where near the end. So the button's clip area has nothing to it to show its area. How would I redefine the button's click area?

[mahlok]

I asked this late last night and I don't think I made myself very clear. The button's click area is really small and on the left side of the stage. I want to put the click area on the right side of the stage and make it really big, so it follows the movie clip.

[mahlok]

I made a quick example of what I'm talking about doing. It's a little hard for me to put it into words.

Example (http://sotemusic.com/testing/example.swf)
Source (http://sotemusic.com/testing/example.fla)

Edit: was pointing at a nonexistent file
Edit 2: gave a reason for the first edit