How can I create content within a webpage? (see video)

Here is what my client wants: A “Classifieds” or “Personal Ads” page. Here’s what he wants visitors to do: 1. Enter the page 2. Enter text on a form box 3. Click “submit” He also wants: 4. A paypal popup window asking if the visitor is sure about the ad, with a “pay now” button. After sucessful payment, the ad will be live on the page with all the others. He said it would be good if every post is inside of a rounded corners rectangle with a colored background. Can be made with Rapidweaver/Stacks? Here is a video sample I made with keynote just to give you an idea: http://www.albertkinng.com/DRAGSTER/sample.m4v