if (document.images) {

img1on = new Image(); //On graphics
img1on.src = "http://www.windhambuilders.com/graphics/nav/PROFILE-black.jpg";
img2on = new Image();      
img2on.src = "http://www.windhambuilders.com/graphics/nav/APPROACH-black.jpg";
img3on = new Image();      
img3on.src = "http://www.windhambuilders.com/graphics/nav/COMMIT-black.jpg";
img4on = new Image();
img4on.src = "http://www.windhambuilders.com/graphics/nav/PORTF-black.jpg";
img5on = new Image();      
img5on.src = "http://www.windhambuilders.com/graphics/nav/NEWS-black.jpg";
img6on = new Image(); 
img6on.src = "http://www.windhambuilders.com/graphics/nav/CONTACT-black.jpg";




img1off = new Image(); //Off graphics
img1off.src = "http://www.windhambuilders.com/graphics/nav/PROFILE-gray.jpg";
img2off = new Image();      
img2off.src = "http://www.windhambuilders.com/graphics/nav/APPROACH-gray.jpg";
img3off = new Image();      
img3off.src = "http://www.windhambuilders.com/graphics/nav/COMMIT-gray.jpg";
img4off = new Image();
img4off.src = "http://www.windhambuilders.com/graphics/nav/PORTF-gray.jpg";
img5off = new Image();      
img5off.src = "http://www.windhambuilders.com/graphics/nav/NEWS-gray.jpg";
img6off = new Image(); 
img6off.src = "http://www.windhambuilders.com/graphics/nav/CONTACT-gray.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");
        }
}