Seamless Transition question

Just to say quickly, this forum is amazing. I’v learnt so much here it’s untrue. I love it.

I want to create a transition where as one page slides off to the left the next page slides in from the right at the exact same speed giving the illusion that the pages are joined at the seem regardless of what page you call up. I figure i need an animation at the start and end of each page which lasts exactly the same number of frames. My question is what code do i need on my buttons to say…“play the current .swf from frame 30 to 45 and at the same time load the next page from frame 1 to 15”

??

Thanks in advance for your expertise on the matter!