Here's more info from a macromedia sponsored site on how to do it. It's been a few years since I've done it myself so I can't help beyond providing these links. I did the "Solar System Demo" which shows flash movies each in their own separate layer being moved and scaled with DHTML. It's pretty buggy and just generally crappy, but I was young, sheesh I'm so embarassed.

Shockwave with DHTML:
http://www.dhtmlzone.com/swdhtml/main.html

Flash in DHTML:
http://www.dhtmlzone.com/swdhtml/usingflash.html

Solar System Demo:
http://www.dhtmlzone.com/swdhtml/dem...stem/index.htm