Ajax or Javascript menu

A qustionaire that will allow my clients to pick options and and based on those options more options will open. When they get to the final result a page will appear. Just looking for the function. This will appear on my homepage in a 200 wide by 90 pixel tall red box that will say start here ask a first question what Product are you looking for? The first answers will be 1.) custom website, website template, splash page, CMS/Blog or Turnkey Website. Once answer is selected the box will expand and blow up big 700 pixels by 700 pixels this will appear in the foreground of the webpage. I would like the background to be like 75% opaque so you could still see the website behind it but you wan read the text in the box In the big box, these are the options will appear for each of the 5 initial choices ( "-" means sub option) 2.) a. provide a product, b. a service or c. informational a. store type - ecommerce shopping cart - dropship - or amazon store - category - color - size (1 page, 3 page, 5 page, 7 page, 10 page, more than 10 pages - then types of products 50 plus for each option b. Service - category - color - size (1 page, 3 page, 5 page, 7 page, 10 page, more than 10 pages - then types of services 50 plus for each option ( i will provide, or point me to where to add them) c. Informationial - category - color - size (1 page, 3 page, 5 page, 7 page, 10 page, more than 10 pages - then types of services 50 plus for each option ( i will provide, or point me to where to add them)