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

function switchImage(imgName, imgSrc) {
  if (document.images && (preloadFlag == true))
  {
    if (imgSrc != "none")
    {
      document.images[imgName].src = imgSrc;
    }
  }
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		overF = newImage("millipedeOver.png");
		overA = newImage("homeOver.png");
		overB = newImage("backgroundOver.png");
		overC = newImage("experimentOver.png");
		overD = newImage("linksOver.png");
		overE = newImage("publicationsOver.png");
		preloadFlag = true;
	}
}