Flash to start playing when div is made visible in javascript

I have some javascript on some text links that displays a new flash banner when I rollover the link. Thisbasically just hides/shows one of several flash animations on the page. When I first go to the page and rolloever a link, the flash will animate. But then when I revisit a link the flash will remain static, as if it has finished it’s animation and now won’t start again.

How can I tell flash that the focus is on it again, and to start animating again?