Order Form Javascript!! EASY

I need this project done immediatly. Please take a look at this page: [login to view URL] This is NOT our website, this is our competitors website. Our order form looks just like this, same exact fields. I want our order form to work just like this, all i need is the first portion of this order form to work off eachother when a user selects the package, the options change below an so on.. I need it commented, well written, easy code, so I can easily change, add, modify options and functionality later on as I am learning javascript myself. I would like to have this completed by monday afternoon Pacific Time.