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) {
		nav1_over = newImage("/images/nav1ov.gif");
		nav2_over = newImage("/images/nav2ov.gif");
		nav3_over = newImage("/images/nav3ov.gif");
		nav4_over = newImage("/images/nav4ov.gif");
		preloadFlag = true;
	}
}

/*
function preloadImages() {
  if (document.images) {
    ftr_index_ov = newImage("/images/ftr_index_ov.jpg");
    ftr_mailto_ov = newImage("/images/ftr_mailto_ov.jpg");
    ftr_over_ov = newImage("/images/ftr_login_ov.jpg");
    smnuhomepage_over = newImage("/images/smnuhomepage_ov.jpg");
    smnumailto_over = newImage("/images/smnumailto_ov.jpg");
    smnulogin_over = newImage("/images/smnulogin_ov.jpg");
    preloadFlag = true;
  }
}
*/