if (document.images) {

img1on=new Image();
img1on.src="images/whatsnew-link.on.jpg";
img1off=new Image();
img1off.src="images/whatsnew-link.off.jpg";

img2on=new Image();
img2on.src="images/objectives-link.on.jpg";
img2off=new Image();
img2off.src="images/objectives-link.off.jpg";

img3on=new Image();
img3on.src="images/publications-link.on.jpg";
img3off=new Image();
img3off.src="images/publications-link.off.jpg";

img4on=new Image();
img4on.src="images/symposium-link.on.jpg";
img4off=new Image();
img4off.src="images/symposium-link.off.jpg";

img5on=new Image();
img5on.src="images/alumni-link.on.jpg";
img5off=new Image();
img5off.src="images/alumni-link.off.jpg";

img6on=new Image();
img6on.src="images/contact-link.on.jpg";
img6off=new Image();
img6off.src="images/contact-link.off.jpg";

img7on=new Image();
img7on.src="images/home-link.on.jpg";
img7off=new Image();
img7off.src="images/home-link.off.jpg";

}

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");
        }
}