I can create a PHP-based website for this that integrates JavaScript and AJAX for an efficient, aesthetically-pleasing end-user experience. This should be easily attainable within the 4 days I have estimated, if not more quickly.
I will be using Adobe Dreamweaver for the PHP design of the project, and will test it across multiple browsers (Chrome, Firefox, IE, Opera, etc). Depending on the amount of debugging required during the final phase of the project, I would be wiling to knock an additional 10-30 dollars off of the final project cost.
I have professional and hobbyist experience in PHP, integrating mySQL databases into websites and Flash games, as well as designing/implementing social features within websites. I have sent a message to your PMB with more information on my previous experience.