Loadmovie - goto last frame

I have run into a snag! I can’t target a specific frame after loading swf file.

I ‘m creating a continuous slideshow with five separate swf’s (movie01.swf , movie02.swf… etc) which load sequentially into one empty movieclip (named - mainMCholder) on the root timeline I control the loaded swfs with 2 buttons—next and previous. These buttons simply move up or down a frame (nextFrame/prevFrame)

So my problem is that if I load movie02.swf into my empty movieclip and I’m on frame 1 (of 10) and choose to back up to the end of movie01.swf (which would be frame 10 of movie01.swf), I end up on frame 1 of movie01.swf. Unsure why I can’t move to last frame of a loaded movie?

//This is the code I’ve used
loadMovie( movie01.swf, “mainMCholder”);
mainMCholder.gotoAndPlay(“lastframe”);

Thanks in advance,