You can probably do that. I just tried this:
Code:
messages[0] = new Array('images/dot-com-btn.gif','<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/bnsF5lIqw1s"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/bnsF5lIqw1s" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>',"#FFFFFF");
And it showed the swf onmouseover of the link for that message item (after it loaded, and I couldn't play it because it disappeared when I moved my mouse over the tip). This is a byte heavy video swf from YouTube, if you have a small lightweight one that requires no user interaction, it could work out. Sound (if included in your swf) would be the biggest problem, because some, if not all browsers would continue to play the sound even when the swf disappears.
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