// preload images
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) {
	image_name = newImage("../images/image-name-over.jpg");
	preloadFlag = true;
  }
}
// end preload images