var total = 17 // Number to update when more pictures are added to album.
var startP = 1
var endP = startP + 2

function scrollR(){
  if ((endP+1) < total || (endP+1) == total){
    startP += 1
    endP = startP + 2
    document.thumb1.src = 'images/alb' + startP + '.jpg'
    document.thumb2.src = 'images/alb' + (startP+1) + '.jpg'
    document.thumb3.src = 'images/alb' + endP + '.jpg'
  }
}//scrollR

function scrollL(){
  if ((startP-1) > 1 || (startP-1) == 1){
    startP -= 1;
    endP = startP + 2;
    document.thumb1.src = 'images/alb' + startP + '.jpg';
    document.thumb2.src = 'images/alb' + (startP+1) + '.jpg';
    document.thumb3.src = 'images/alb' + endP + '.jpg';
  }
}//scrollL

function showBig(which){
  document.imgBig.src = which;
}//showBig