var onImage = new Image(10,10);
onImage.src = "sys/images/arrow.gif";
var offImage = new Image(10,10);
offImage.src = "sys/images/noarrow.gif";

function imgover(imgname) {
	imgname.src = onImage.src;
}
function imgout(imgname) {
	imgname.src = offImage.src;
}