function imgminus(){
  currentImage--;
}

function imgplus(){
  currentImage++;
}

function moveToPrev()
{
  if(currentImage > 0)
  {
	new Effect.Move('imageBoxInside', 
		{ x: 144, 
			y: 0, 
			afterFinish: imgminus, 
			transition: Effect.Transitions.sinoidal, 
			queue: { position: 'end', scope: 'global', limit: 1 }
		}
	); 
  }
}

function moveToNext()
{
  if(currentImage < totalImages-viewSize)
  {
	new Effect.Move('imageBoxInside', 
		{ x: -144, 
			y: 0, 
			afterFinish: imgplus, 
			transition: Effect.Transitions.sinoidal, 
			queue: { position: 'end', scope: 'global', limit: 1 }
		}
	); 
  }
}