Text form linking to various pages. HTML or JavaScript

I need a basic code written in HTML or JavaScript that when a person enters the correct text in a form field and click submit they will be directed to a corresponding page. E.G. In the field someone types the code [cars07] and clicks submit. Upon clicking submit the code recognizes it is a valid code and sends them to a url set up for that code e.g. /[login to view URL] If someone were to place an incorrect code, upon clicking submit they should get a error popup saying that the code was incorrect. I need to be able to add more allowed codes in the future. Thanks for the help, ## Deliverables 1) Complete and fully-functional 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 Needs to be functional in most browser types. Must work with IE7 and older, Firefox, Aol, and Safari. Prefered that it will work with others but those are my main concerns.