Effect.moveTo= function(container, element){
  Position.prepare();
  container_x = Position.cumulativeOffset($(container))[0]
  element_x = Position.cumulativeOffset($(element))[0]
  container_y = Position.cumulativeOffset($(container))[1]
  element_y = Position.cumulativeOffset($(element))[1]
  return new Effect.Scroll(container, {x:(element_x-container_x), y:(element_y-container_y)});
}