You souldn't need to use javascript to do this, in flash, use the actions to load and play another movie at your command. you could also use flash to change the url of the web browser to the other flash movie. I think the command is getUrl. for more information, check out the flash forum.
theEclipse
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robacarp.webjump.com
**-Trying to build a documentation of a Javascript DOM, crossbrowser, of course. E-mail me if you know of any little known events and/or methods, etc.