code: function (comp, callback, callbackOff) {
  		var justHit = false;
  		this.bind("EnterFrame", function () {
  			var hitdata = this.hit(comp);
  			if (hitdata) {
  				justHit = true;
  				callback.call(this, hitdata);
  			} else if (justHit) {
  				if (typeof callbackOff == 'function') {
  					callbackOff.call(this);
  				}
  				justHit = false;
  			}
  		});
  		return this;
  	}
docs: @
  #.onHit
  @comp Collision
  @sign public this .onHit(String component, Function hit[, Function noHit])
  @param component - Component to check collisions for
  @param hit - Callback method to execute upon collision with component.  Will be passed the results of the collision check in the same format documented for hit().
  @param noHit - Callback method executed once as soon as collision stops
  
  Creates an EnterFrame event calling .hit() each frame.  When a collision is detected the callback will be invoked.
  
  @see .hit