SMALL ADS/OFFERS WEBSITE (Wordpress)

The project is car exchange platform for anybody who wishes to swap his car for an another one without having to pay anything. People must log in and publish their offer (Car, SUV, van or motorcyle, and all the adequate information about the vehicule and pictures of course.) As soon as the offer is validated by the administrator, the offer is online and they have access to all the other ads including the contact information of the others. They can search with their own criterias with a basic engine and multi criteria search engine. Subscribers will have to pay to publish their offer (so we have to install a paypal solution) and we will have 4 different offers and prices for them (details will be given) We must be able to put some free periods to promote the platform and get enough content to be atractive. I would like preferably a wordpress solution so that another computer scientist can easily access and make some changes. 2 important things however... 1/I will develop the static pages of my website, I would like the rest included in frames (if it is technically possible) 2/The front office must be in spanish as the project is for the latin american market Any question, I will gladly respond