[Dean C]

I'm pretty new to JS myself and have done something similar to this before. The difference was I was generating my page contents dynamically instead of relying on user input. All I can suggest is there are some fantastic JS experts over at sitepointforums.com and they undoubtedly will know the solution to your problem. If I sat down for 30mins I probably could figure it out for you. But right now I'd be going around in circles.

The basics of what you want to do is run a JS function everytime the input is changed. The value of the input is passed to the function. You mentioned you only want to change the page number based on certain values that can be entered in the form. So within the function you'd use some IF statements to check if the value passed to the function is the same as one of the required inputs. Based on this you'd assign a value to another JS variable. Then using this JS variable you'd generate the link you like dynamically.

It's easy really to explain how to do it, it's just a pain to write it Try over at sitepoint and if you get no luck come back and I'll have another play