Replying to HTML help

I'm in a bit of a pickle here, and I'm getting very frustrated.

what I'm looking for is an HTML form in which a user can enter data (textbox). But the data they enter when submitted should go directly to URL.

eg. they enter "haha" in the textbox, hit submit and it should send them to haha.html

If someone knows the answer to do this, it would be greatly appreciated