var cur = 0;
var imgW = 100;
var imgLenth = 100;
var scrollX = 0;

function browsePrev(){

   if(cur - 1 >= 0){
      cur--;
      scrollX += 160;
      moveScroller();
   }
   
}

function browseNext(){
   
   if(cur + 1 < imgLenth){
      scrollX -= 160;
      cur++;
      moveScroller();
   }

}

function moveScroller(){

   new Effect.Morph('scroller', {
      style: 'left: '+scrollX+'px',
      duration: 0.8
   });
   
}