I am working with a non-profit group that would like to add some interactivity to their site. Specifically they want to be able to have people post pictures and experiences with a national park here and then have a moderator approve posts before they are posted. We want anyone to be able to post, but I don't need a whole forum. The site is currently static. Does anyone know of available software that would work for this, or do I need to custom program a solution?

Thanks for your help!