Web Client timer technique(s )

[B]

I would like to put together a webcontrol (or page) that refreshes
content on an interval with no user input.

I am pretty confident I can write this into an applet, but I am
wondering if I am overlooking something obvious.

Is there anything like a timer that works on a browser client?
I have been looking at ad-rotator control, but have not speant any
significant time digging into it yet.

Thanks for any input,
(B )