Swf with button to load over itself

I have an swf that loads in another swf into a ‘holder’ using the following code:

_root.holder.loadMovie(“index_load.swf”)

stop();

The holder is only part of the swf movie.

When this index_load.swf loads in, it has a button which when pressed i want another swf to take it’s place within the original swf holder.

Can’t seem to get the right code.

Thanx in advance.