if (document.images) {
            img1on = new Image();
            img1on.src = "gfx/chome-o.gif";
                        
            img1off = new Image();
            img1off.src = "gfx/chome.gif";


            img2on = new Image();
            img2on.src = "gfx/coorzaak-o.gif";
                        
            img2off = new Image();
            img2off.src = "gfx/coorzaak.gif";


            img3on = new Image();
            img3on.src = "gfx/cdiagnose-o.gif";
                        
            img3off = new Image();
            img3off.src = "gfx/cdiagnose.gif";


            img4on = new Image();
            img4on.src = "gfx/coefen-o.gif";
                        
            img4off = new Image();
            img4off.src = "gfx/coefen.gif";


            img5on = new Image();
            img5on.src = "gfx/cwaar-o.gif";
                        
            img5off = new Image();
            img5off.src = "gfx/cwaar.gif";


            img6on = new Image();
            img6on.src = "gfx/ccontact-o.gif";
                        
            img6off = new Image();
            img6off.src = "gfx/ccontact.gif";


            img7on = new Image();
            img7on.src = "gfx/creacties-o.gif";
                        
            img7off = new Image();
            img7off.src = "gfx/creacties.gif";

        }

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

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