function changeImg(newImg){
	document.getElementById("kaartnuenen").src = ""+newImg;
}
function wopen(url, name, w, h)
{
  w += 32;
  h += 96;
  wleft = (screen.width - w) / 2;
  wtop = (screen.height - h) / 2;
  if (wleft < 0) {
    w = screen.width;
    wleft = 0;
  }
  if (wtop < 0) {
    h = screen.height;
    wtop = 0;
  }
  var win = window.open(url,
    name,
    'width=' + w + ', height=' + h + ', ' +
    'left=' + wleft + ', top=' + wtop + ', ' +
    'location=no, menubar=no, ' +
    'status=no, toolbar=no, scrollbars=no, directories=no, resizable=no');
  win.resizeTo(w, h);
  win.moveTo(wleft, wtop);
  win.focus();
}