var imgArray = new Array();
  var nPointer = 0;
  
  imgArray[0] = new Image(320,200);
  imgArray[0].src = "images/kaart1x.gif";
  imgArray[1] = new Image(320,200);
  imgArray[1].src = "images/kaart2x.gif";
  imgArray[2] = new Image(320,200);
  imgArray[2].src = "images/kaart3x.gif";
  imgArray[3] = new Image(320,200);
  imgArray[3].src = "images/kaart4x.gif";
  imgArray[4] = new Image(320,200);
  imgArray[4].src = "images/kaart5x.jpg";
  
  function Zoom(img,arr,dir) {
    var MIN = 0;
    var MAX = arr.length - 1;
    switch (dir) {
      case "in" :
        if ((nPointer + 1) <= MAX) {
          nPointer++;
          document.images[img].src = arr[nPointer].src;
        }
        break;
      case "out" :
        if ((nPointer - 1) >= MIN) {
          nPointer--;
          document.images[img].src = arr[nPointer].src;
        }
        break;
    }
  }