Proximity Search by ZIP Code. ASP Page

I have an ASP page with a search form. You can search by city or state or zip (currently works great). If my user types a zip code that is not in our DB then it says "no results found". I want to add a proximity field so they can say search within x amount of miles. So my user can type their zip code and then go to the next field and add 5,10,20 whatever and it would then search their zip code within the amount specified. It can also be a drop down if that is easier to code. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform IIS 6.0 Access 2000 Frontpage 2000 I do not have SQL server so it has to be made for access using an ASP page. Thanks.