Add a button over a FLV movie

I’ve made an animation in After Effects (1:40 min). At the end of the movie appears 3 buttons.

I used the “standard” “load external video with playback component” option in Flash to load the FLV in the swf.

My problem is that I would like to add 3 invisible buttons at 1:20min over de FLV movie so people can click on it to go to a webpage. I tried to add a button at frame 1440 (18 frames x 80 sec), but that doesnt work because of the playback.

Maybe there is a different or better solution for this, I hope you guys can help me with this problem.