html oder javascript

[_m3]

Entweder als Animated GIF/PNG (eine Google-Suche bringt mehr Info) oder Du lädst die ganze (dynamisch generierte) Seite neu.
z.B:<META HTTP-EQUIV="Refresh" CONTENT="10;URL=http://www.wcm.at/">

Aber:

Some user agents support the use of META to refresh the current page after a specified number of seconds, with the option of replacing it by a different URI. Authors should not use this technique to forward users to different pages, as this makes the page inaccessible to some users. Instead, automatic page forwarding should be done using server-side redirects.

http://www.w3.org/TR/html401/struct/...def-http-equiv