public void setBackground(txNGUITexture background)
 {
     mBackground = background;
     mBackground.setOnMouseDown(onMouseDown);
     mBackground.setOnScreenMouseUp(onScreenMouseUp);
     mBackground.setOnMouseMove(onMouseMove);
     mBackground.setOnMouseStay(onMouseStay);
     mScript.registeBoxCollider(mBackground, true);
 }