repost: Flash file swap in Dreamwaver Behaviors?

After searching both the Dreamweaver and Flash forums, I am still confused
on how to:

Randomly load Flash files on page load. I have three different flash
banners that I would like to randomly display on page load. I can not find
any built in "behavior" in Dreamweaver to enable this. (I am guessing this
is best accomplished with Javascript, but am not fluent enough to create my
own script.).

Does a precanned behavior exist in Dreamweaver that I am missing and/or can
someone suggest a source to acquire such a script?

Thanks in advance, - Jeff