LOCKED: Help me

Holla! I'm the beginner of indesign user. I've got my deadline homework that I have to make an interactive portofolio.

I want to make my button have an animation, so I choose fade in into my button. After that I insert interactive-media-mp3, I insert my music to be backsound. Butttttttttt, when I played in swf my button animation played first. After all of my button animation appear, backsound played in the last.

How to get backsound and animation play together? I was so stressed!!!! Tomorrow is my deadline, please help me: (