swapping a nestied swf inside a movie clip

[almondo]

Hi...
Ive nested a swf file within a movie clip on my main timeline...
I want to have a button within the nested swf that unloads itself from the movie clip and loads a different swf file in its place...
Can anyone help??
i have a new swf loading into the movie clip but its over the previous swf thats still running!!
/i'm kind of new at this and its driving me crazy, so if anyone can help it would be greatly appreciated...
Thank You

Here's the code i'm using to load in the swf (AS2 CS3)

_root.my_loader.loadClip("/guestbook/guestbook.swf", "_root.holderMC");

my_loader is a preloader and again it just loads "guestbook.swf" in front of the original swf while the original still runs in the background!!!!

Thanks again