var loaded = false;

if (document.images) {
    img1off = new Image();img1off.src = "pics/sense2.jpg";
    img2off = new Image();img2off.src = "pics/sense4.jpg";
}


function imageLoad() {
    if (document.images) {
        img1on = new Image();img1on.src = "pics/sense2o.jpg";
        img2on = new Image();img2on.src = "pics/sense4o.jpg";
        return (loaded = true);
    }
}

function rollOut(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName+"off.src");
    }
}

function rollIn(imgName) {
    if (document.images && (loaded == true)) {
        document[imgName].src = eval(imgName+"on.src");
    }
}