text: (function(Behaviour) {
  
    Behaviour.prototype.addParticle = function(particle) {
    };
  
    Behaviour.prototype.removeParticle = function(particle) {
    };
  
  })(NDP.Behaviour.create('CollisionBehaviour',
    function() {
    },
    function(particle, delta, index) {
    }
  ));
  