arrowOn = new Image(); arrowOn.src = "img/box-orange.gif";
arrowOff = new Image(); arrowOff.src = "img/box-grey.gif";

function navOver(object) {
 document.getElementById(object).src=arrowOn.src;
}

function navOut(object) {
 document.getElementById(object).src=arrowOff.src;
}