XML Menu

Hi, i have made a site, but wonder if its best to have either like 20 different .fla files or one .fla with everything in the single .fla file?

And is it possible to have an xml menu load a frame or mc ? So i could have an xml menu, and i click a button and it loads or gotoandplay a frame in the fla file?

Im not so good describing my question, but if you know, please reply :slight_smile:

Thanks