Changing links by changing vars

[Tekton]

I'm not sure if I'd need javascript or something, but I'd like to have a link on the page that would change it's value based on is put in an input box on the page in a form. I don't want a submit button as there's quite a few of these links. An example would be www.site.com/blablabh&number=x where x is what is in the input box.

*is totally stumped* ^^;;;