There are two ways I can think of to do this... Either use a meta redirect, or set a javascript timer.
For each of them you should be able to find tons of documentation on the internet. If you know the URL that the user would click on, you would just use that in either of the solutions mentioned above.
For the meta redirect, I think that these very boards do something like that after you post.
For the javascript one, you would use the self.setTimeout (I think) in conjunction with window.location.
Give those a look, figure out which one would suit your needs the best, and post back if you have any problems.
Cheers,
Erestar