Web site + web desing , ajax+mysql + php (or other) + security

A Web Page, that use the simplicity of ajax, mysql as database manager. **Security and related web money transaction is a excluder condition for coder**. it is a web site that should handle money transactions, but main matters is look and feel, using javascript as much as possible to make a desktop sensation. The site should be able to register two kind of users, users which should ask for a service and users which will offer that service. Offered user, should be able to show that he is carry out with "buyer" user, by showing links, and other proofs. Buyer user should be able to select between several "sellers" characteristics and "sellers" which are in this category are returned. In resume, some users will log in to the site looking for something, and other will offer, and both must have site tools either to show their attributes or what they are looking for. When buyer has found some "seller" he likes, it should be able to via pay-pal to pay for requested service (every seller characteristic + how much the service will be use is the final price). After pay (maybe pay is at end), seller has the obligation to complain with the seller and should perform the service. This service has an expiration date and meanwhile seller should show IN THIS SITE that he is carry out with the services by sending the appropriated link, picture or other Internet resource as proof. This will be for site administrator proof that seller is complaining. Obviously, there should be history record for "services" bought or "services" accomplish. As a final resume, it should be a SMALLER, SIMPLER ebay or rentacoder site. The simpleness is that it ONLY EXISTS ONE PRODUCT to sell/buy which several variations. I am sorry anyway if you find vague but, more business requirements are confidential an can not be given in this stage. Any further asking for information you need before your bid will be welcomed ## Deliverables Ajax should be use much as possible,so look and feel of the site is kind desktop. This means, that most click should not change the page, but only (through javascript) change some viewable area and show the new info. Please if you need further information ask NOT in general terms, but in a detail specific way. "What do you mean with ..." , "i do not understand....". Please do not be vague with "more details" only. Every doubt is welcomed. Thanks * * *This broadcast message was sent to all bidders on Sunday Sep 6, 2009 3:37:51 PM: Requirements and other details has been changed. Please re-read the bid request. More specifications are given. Thank you. * * *This broadcast message was sent to all bidders on Monday Sep 7, 2009 8:21:04 PM: Hello, as one of the bidders has asked us, in fact the site is a very very so much simplified version of rentacoder site, I repeat very so much simplified and smaller (don't get scared :-D). We do not want this kind of detail in this stage. If you are in doubt about a particular design/implementation/functionality that you think can raise to much the bid, please ask about it, we are happy to answer. It is probable that functionality is missing from this project. So you have not to worried about it and possible low your bid. Also remember that installation is not part of this project. And that xampp /lampp use is desirable. Final delivery date is 80-90 day. This is also negotiable if you think that this can change your bid. Second part of this project (not included in this bid) is installation and fixes, so we will continue working with the bidder if success in this stage. Of course, site fixes and future modifications too. Thanks for the attention, doubts are welcomed, bids also :-).