if (document.images) {

	// nav over images
    img1on = new Image();
    img1on.src = "images/nav/home_on.gif";
    img2on = new Image();
    img2on.src = "images/nav/facilities_on.gif";
    img3on = new Image();
    img3on.src = "images/nav/comments_on.gif";
    img4on = new Image();
    img4on.src = "images/nav/jobs_on.gif";
    img5on = new Image();
    img5on.src = "images/nav/fees_on.gif";
    img6on = new Image();
    img6on.src = "images/nav/contact_on.gif";
    
    
    img7on = new Image();
    img7on.src = "images/subnav/under2_on.gif";
    img8on = new Image();
    img8on.src = "images/subnav/over2_on.gif";
    img9on = new Image();
    img9on.src = "images/subnav/leith_on.gif";
    img10on = new Image();
    img10on.src = "images/subnav/morningside_on.gif";

	// nav off images
    img1off = new Image();
    img1off.src = "images/nav/home_off.gif";
    img2off = new Image();
    img2off.src = "images/nav/facilities_off.gif";
    img3off = new Image();
    img3off.src = "images/nav/comments_off.gif";
    img4off = new Image();
    img4off.src = "images/nav/jobs_off.gif";
    img5off = new Image();
    img5off.src = "images/nav/fees_off.gif";
    img6off = new Image();
    img6off.src = "images/nav/contact_off.gif";
    
    
    img7off = new Image();
    img7off.src = "images/subnav/under2_off.gif";
    img8off = new Image();
    img8off.src = "images/subnav/over2_off.gif";
    img9off = new Image();
    img9off.src = "images/subnav/leith_off.gif";
    img10off = new Image();
    img10off.src = "images/subnav/morningside_off.gif";

}

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");
    }
}