Flash rollover buttons in Presenter

I've created rollever buttons in Flash CS5 and added the scripting like it was told in the screenr tutorial by David Anderson. http://www.articulate.com/forums/articulate-presenter/18094-flash-rollover-buttons-hyperlinking-slides.html

But for some  I am not able to have the buttons work in advancing to the particular slides. The rollover action works but when clicking on the buttons it just stays on that slide.

Not sure if I've just been staring at my scripting but it looks correct and it was done in AS 2.0:

mcButton1.onPress = function() {
 
  _level0ArtAPI.PlaySlideNum(4);
};
mcButton2.onPress = function() {
 
  _level0ArtAPI.PlaySlideNum(5);
};

I don't know if it matters but I'm using PPT 03 with Presenter '09 version 6.

Does anyone know why this is not working for me? Thanks