[kh99]

I can't think of anything specific to vbulletin that helps with this, but it's something you could do in html/php. You just need to create a form with your dropdown lists, then submit the form to a php script that looks at the values and decides which page you should see.

You said you don't want access to the page unless they use the search criteria - do you mean it should be blocked if they happen to know the url but didn't use the search? That's more difficult - I can't think how you'd do that offhand, especially if the target pages are just static html pages.