gistfile1.js

          redis.zrangebyscore(key, pos, "inf", function(error, to_incr) {
            var cmds = [];
            if (to_incr) {
              for (var z = 0; z < to_incr.length; z++) {
                cmds.push(['zincrby', 1, to_incr[z]]);
              }
            }
            cmds.push(['zadd', key, pos, slideId]);
            redis.multi(cmds).exec(cmds, function(err, results) {
              res.writeHead(200, {'Content-Type': 'text/html'});
              console.log("returning: " + slide);
              res.end(jade.render(slide));
            });
          });