if (document.images) {

arrowoff = new Image();
arrowoff.src = "/images/arrow_off.gif";
arrowon = new Image();
arrowon.src = "/images/arrow_on.gif";

}

function swapImage(imgid,imgnew) {
	if (navigator.appVersion.substring(0,1) >=3) {
			document.images[imgid].src=eval(imgnew + ".src");
	}
}