drag

FirstAssistant.prototype.dragStart = function(event) {
   //Event.pointerX(event.down) && Event.pointerY(event.down)
   Element.observe(this.trackingArea, Mojo.Event.dragging, this.draggingHandler);
   Element.observe(this.trackingArea, Mojo.Event.dragEnd, this.dragEndHandler);
   Event.stop(event);
}

FirstAssistant.prototype.dragging = function(event) {
   this.controller.get("sStatus").style.left = Event.pointerX(event.move) + "px";
   this.controller.get("sStatus").style.top = Event.pointerY(event.move) + "px";
    Event.stop(event);
}

FirstAssistant.prototype.dragEnd = function(event) {
   Element.stopObserving(this.trackingArea, Mojo.Event.dragging, this.draggingHandler);
   Element.stopObserving(this.trackingArea, Mojo.Event.dragEnd, this.dragEndHandler);
   Event.stop(event);
}