ase 37:
            scene.prevTarget();
            break;
          case 39:
            scene.nextTarget();
            break;
        }
      }

      // The scene's context element
      var saga = document.getElementById('saga');

      var scene = new ParticleSaga.Scene(saga, targets, {
        numParticles: 40000,
        sort: ParticleSaga.VertexSort.leftToRight
      });
      scene.load(function() {
        setupDemoUI();
        scene.setTarget(0);
        scene.startSlideshow();
      });
    </