var preload = false;

function preloadImages() {
      if(document.getElementById) {
            markerOn = new Image();
            markerOn.src = "/template/images/menumarkersel_trans.gif";
            markerOff = new Image();
            markerOff.src = "/template/images/menumarker_trans.gif";
            preload = true;
      }
}

function hoverOn(imageName) {
	if(!preload) return;
	img = document.getElementById(imageName);
	if(img != null) img.src = markerOn.src;
}

function hoverOff(imageName) {
	if(!preload) return;
    img = document.getElementById(imageName);
	if(img != null) img.src = markerOff.src;
}