Alterations in Million Dollar Open Source Script - URGENT

We have a client you requires some alterations on million dollar open source script. Its a basic pixel based online ad system. Have a look at [login to view URL] for more details on script. Our client site and FTP access shall be given to successful provider. Its a very simple job which requires not more than 6 hours for a PHP expert. Its very urgent and we require the output within 50 hours from the time of BID selection. Alterations Required: 1. Ad categorization: A link called "Education" will be kept and ads related to education shall alone be shown to the user inside the grid or in a pop up. 2. Small changes in design - These details to be given to successful provider. Payment: There are some alterations in the home page and if once this is done the agreed amount will be deposited in escrow. No front-payment or escrow till then. Total budget: 60USD