Hi! I am looking to have a page on my site where local people (restricted to my county and extreme local area) can place free classifieds for "buy & sell" and "want ad" items. I want to use thier zip code (postal code) to allow them access to place ads on the site. I want it to be set up so that if they enter a postal zip other than my preselected ones, they will not be able to post ads. I also want to set a time limit on the ads, so that they will automatically delete themselves after so many days (14 ). Has anyone ever created something like this?