if (document.images) {

imgN1on = new Image(); imgN1on.src = "../../../images/on/media.jpg"; imgN1off = new Image(); imgN1off.src = "../../../images/off/media.jpg";
imgN2on = new Image(); imgN2on.src = "../../../images/on/cottnews.jpg"; imgN2off = new Image(); imgN2off.src = "../../../images/off/cottnews.jpg";
imgN3on = new Image(); imgN3on.src = "../../../images/on/yearbook.jpg"; imgN3off = new Image(); imgN3off.src = "../../../images/off/yearbook.jpg";
imgN4on = new Image(); imgN4on.src = "../../../images/on/feedback.jpg"; imgN4off = new Image(); imgN4off.src = "../../../images/off/feedback.jpg";

imgN1Aon = new Image(); imgN1Aon.src = "../../../images/nav/ball_gold.jpg"; imgN1Aoff = new Image(); imgN1Aoff.src = "../../../images/nav/off.gif";
imgN2Aon = new Image(); imgN2Aon.src = "../../../images/nav/ball_gold.jpg"; imgN2Aoff = new Image(); imgN2Aoff.src = "../../../images/nav/off.gif";
imgN3Aon = new Image(); imgN3Aon.src = "../../../images/nav/ball_gold.jpg"; imgN3Aoff = new Image(); imgN3Aoff.src = "../../../images/nav/off.gif";
imgN4Aon = new Image(); imgN4Aon.src = "../../../images/nav/ball_gold.jpg"; imgN4Aoff = new Image(); imgN4Aoff.src = "../../../images/nav/off.gif";

        }

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

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