Javascript and php modify

I have a classifieds website that has been written in php with some Javascript that is used to validate different areas of the webpages. Customers are required to enter details when placing classifieds, such as category, title, price, description etc. I want to modify the javascript or php... so that when people choose certain categories of the classifieds it does not ask for a price. This is an easy job for people with these skills, and should be done very quickly. ## 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 5+ Versions of IE and Netscape, Mozilla. Runs on linux with Cpanel.