function MoveLeft()
{
    new Effect.MoveBy('staff', 0, 570 , 
                              {
                                  duration: 0.4,  
                                  transition: Effect.Transitions.sinoidal
                              });
}

function MoveRight()
{
    new Effect.MoveBy('staff', 0, -570 , 
                              {
                                  duration: 0.4,  
                                  transition: Effect.Transitions.sinoidal
                              });
}