function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    // _01_02_over = newImage("images/01-02_over.jpg");
    two = newImage("images/02-over.jpg");
    three = newImage("images/03-over.jpg");
    four = newImage("images/04-over.jpg");
    five = newImage("images/05-over.jpg");
    six = newImage("images/06-over.jpg");
    seven = newImage("images/07-over.jpg");
    eight = newImage("images/08-over.jpg");
    preloadFlag = true;
  }
}