if (document.images) {

img1on = new Image(); //On nav
img1on.src = "images/home-ro.jpg";
img2on = new Image();      
img2on.src = "images/landscape-a-ro.jpg";
img3on = new Image();      
img3on.src = "images/pools-ro.jpg";
img4on = new Image();
img4on.src = "images/outdoor-ro.jpg";
img5on = new Image();      
img5on.src = "images/landscape-con-ro.jpg";
img6on = new Image(); //On nav
img6on.src = "images/landscape-b-ro.jpg";
img7on = new Image();
img7on.src = "images/commercial-ro.jpg";
img8on = new Image();
img8on.src = "images/portfolio-ro.jpg";
img9on = new Image();
img9on.src = "images/contact-ro.jpg";




img1off = new Image(); //Off nav
img1off.src = "images/home.jpg";
img2off = new Image();      
img2off.src = "images/landscape-a.jpg";
img3off = new Image();      
img3off.src = "images/pools.jpg";
img4off = new Image();
img4off.src = "images/outdoor.jpg";
img5off = new Image();      
img5off.src = "images/landscape-con.jpg";
img6off = new Image(); //Off nav
img6off.src = "images/landscape-b.jpg";
img7off = new Image();
img7off.src = "images/commercial.jpg";
img8off = new Image();
img8off.src = "images/portfolio.jpg";
img9off = new Image();
img9off.src = "images/contact.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");
        }
}