Navigation Control with External swf's

I got a problem, hoping you guys can help me out!!
I’m currently building a demo tour in flash, I created
a main swf that has an intro and navigation. Each
link on the main.swf calls a loadMovie and loads each
section with external swf’s in an empty movie clip.

What I’d like to add is 2 buttons, which are next and
back, giving the user the flexibility of going through
each section, using these 2 buttons. Its just that
since each section is an external swf file, I’m not
sure how to script the 2 back and next buttons…

any suggestions?? Need this real bad, real quick!!

Thanks!!