Applying one AS script to more than one movieClip?

Yo,

I’m a very competent PHP/AS coder, but I can’t seem to find a way to solve this problem. Can it be done? Possible ways I’ve theorised (but not been able to put into practice yet):

  1. Loading AS script from external text file, much like loading CSS, or JS in HTML.

  2. Writing AS to a movieclip as it is created on the fly.

If anyone could help, I’d be much obliged!

Cheers,

MM