if (document.images) {       //if image object is available     

img1off = new Image();
img1off.src = "images/home-off.jpg";
img2off = new Image();
img2off.src = "images/product-off.jpg";
img3off = new Image();
img3off.src = "images/literature-off.jpg";
img4off = new Image();
img4off.src = "images/faqs-off.jpg";
img5off = new Image();
img5off.src = "images/dealers-off.jpg";
img6off = new Image();
img6off.src = "images/contact-off.jpg";

img1on = new Image();
img1on.src = "images/home-on.jpg";
img2on = new Image();
img2on.src = "images/product-on.jpg";
img3on = new Image();
img3on.src = "images/literature-on.jpg";
img4on = new Image();
img4on.src = "images/faqs-on.jpg";
img5on = new Image();
img5on.src = "images/dealers-on.jpg";
img6on = new Image();
img6on.src = "images/contact-on.jpg";

}

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

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