The home page for our FaceMash clone

home.js

app.get('/', function(req, res){
        db.keys('image:*:location', function(err,keys){
                if (err) { throw err; }
                var offense = keys[Math.floor(Math.random()*keys.length)];
                var defense = keys[Math.floor(Math.random()*keys.length)];
                if (defense == offense) {
                        defense = keys[Math.floor(Math.random()*keys.length)];
                }
                db.mget('image:' + offense + ':location', 'image:' + offense + ':rating',
                        'image:' + defense + ':location', 'image:' + defense + ':rating',
                        function(err, reply){
                                res.render('battle.ejs', {
                                        locals: {
                                                offense: offense,
                                                defense: defense,
                                                battle: reply
                                        }
                                });
                        });
        });
});

Has anyone run across a decent facemash clone with a large number of images? www.facemasher.com just has a static image, but they didn't finish it.