Play/pause buttons controlling a movie within the child file

Hi all, really hoping someone can urgently help. I have built a rich media expanding banner (by rollover) in CS5, AS2. It's polite load, so i have set up a parent file, which pulls through the child file (expanded file). The child file holds the video for which i have built play and pause buttons - which work correctly controlling the video if you export only the child swf file. However when i play the parent file and rollover to view the expanded banner (child file), so essentially when i play the child file through the parent file, the play pause button no longer controls the video, however the scrubbing bar still works fast forwarding through the video. It doesnt make sense as all the code for the play pause button is in the child file which works on its own. Attachment 74275

I have attached the FLA files, please help :)