Why not just make the marquee the applet? ( Or the applet the marquee... either way it works...
)
On the other hand, you could probably just do the entire thing in JavaScript...
From what you have described I see no reason to need to mix
Java and JavaScript...
According to
this fellow the JSObject classes work in IE ( though he mentions some annoyances... ), though I have not personally tried running the Netscape API under IE...
-Nate