if (document.images) {
    img1 = new Image();
    img1.src = "/images/layout/footer/web-design-hover.png";

    img2 = new Image();
    img2.src = "/images/layout/footer/web-development-hover.png";

    img3 = new Image();
    img3.src = "/images/layout/footer/brand-identity-hover.png";

    img4 = new Image();
    img4.src = "/images/layout/footer/print-design-hover.png";
}