Classified Ads management script / website

I'm looking for a script (PHP / MySQL) and website designed for a classified ad management company. What it will deal with is people placing classified ads and then other places picking up the ads (requesting to run them). * It will need to keep track of who runs which ad (including date) * Allow the ad placer to set their own price for their ad placement * Allow for the company to take a certain % of the ad placement price for their own. * Allow ad placer to set requirements to be met if certain people want to place their ad * Set it up to take PayPal payments to fund the classified ad placers account * Subtract payments from the account if ad is placed ... and have the ability to refund the account if errors are made. * Ability to set it up like an escrow account where the company will release to payments from the ad placer to the place where the ad was placed when proof comes in that the ad was actually placed. These are a few of the options needed ... I'd also like the site designed if possible, but not mandatory. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Internet Explorer, Netscape