159773 phpprobid script modification

need expert PHP programmer to modify an existing auction scripts PHPProBid ([login to view URL]), demo can be seen at [login to view URL] Most features I need are already provided by the script, only some Basic Modifications I need: 1. Modify Auction Listing Form, allow user enter multiple pricing level, the code need to check and make sure user enter it correctly, number in a number field, first number must be greater than second number, things like that. 2. Display the extra form entrys on auction detail page like other fields. 3. Allow "Flag" for abuse by user, Admin can manage flagged auctions (delete it or keep it) 4. User can submit pre-bid and later confirm by seller. current Price change according to bids. 5. Paypal and user feedbacks. The script already has payment and feedback feature, but I need it to be accessible to multiple bidders. It is mostly modifying the existing script for features that already exist. Must have good skills in PHP, details can be discussed.