if (document.images) {
    questionOn = new Image();
    questionOn.src = "http://library.apsu.edu/images/questb.gif";
    questionOff = new Image();
    questionOff.src = "http://library.apsu.edu/images/questa.gif";

    questionWhtOn = new Image();
    questionWhtOn.src = "http://library.apsu.edu/images/questb.gif";
    questionWhtOff = new Image();
    questionWhtOff.src = "http://library.apsu.edu/images/questa.gif";
}
function turnOn(imageName) {
    if (document.images) {
        document[imageName].src = eval(imageName + "On.src");
    }
}
function turnOff(imageName) {
    if (document.images) {
        document[imageName].src = eval(imageName + "Off.src");
    }
}