Well,I have do this many time for my menu animations.
FIRST:Add many sence that you need.But don't insert anything in your flash screen.
Example:Sence 1:menu Sence 2:Credits Scence 3:movie
SECOND:Name the sence or don't
Third:Open actions and type stop();.Remember,dont type stop(); on the scence movie.Type play();.Now,copy all frames and paste frames.Made sure you have add layer.Paste frames on the frames 1 layer2.
Fourth:Ok,put anything what yu want in the flash screen.(TEXT)
Fifth:Convert all of the text into button.
Sixth:type code in actions in the button that you have convert to button.For the code movie::on (release){
gotoAndStop("movie",1);
}
There you go. Have fun!! :D