if (document.images) {
  NSBUT1on = new Image(); NSBUT1on.src = "img/nsbuton-1x2.gif";
  NSBUT1off = new Image(); NSBUT1off.src = "img/nsbut-1x2.gif";
  NSBUT2on = new Image(); NSBUT2on.src = "img/nsbuton-1x3.gif";
  NSBUT2off = new Image(); NSBUT2off.src = "img/nsbut-1x3.gif";
  NSBUT3on = new Image(); NSBUT3on.src = "img/nsbuton-1x4.gif";
  NSBUT3off = new Image(); NSBUT3off.src = "img/nsbut-1x4.gif";
  NSBUT4on = new Image(); NSBUT4on.src = "img/nsbuton-1x5.gif";
  NSBUT4off = new Image(); NSBUT4off.src = "img/nsbut-1x5.gif";
  NSBUT5on = new Image(); NSBUT5on.src = "img/nsbuton-1x6.gif";
  NSBUT5off = new Image(); NSBUT5off.src = "img/nsbut-1x6.gif";
  NSBUT6on = new Image(); NSBUT6on.src = "img/nsbuton-1x7.gif";
  NSBUT6off = new Image(); NSBUT6off.src = "img/nsbut-1x7.gif";
}
function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}