Zoomr/Flickr clone script but simpler

Need [login to view URL] / [login to view URL] clone script Basically I need a gallery where users can upload /share / and download images of various sizes for printing It would be much simpler than these 2 above but must be SEO friendly. (will give instructions) I would send graphical page layouts as mock ups to use or I could even make them into php files. Will also need some viral stuff for easy photo sharing. This is a non profit thing.