if (document.images) {

            img1on = new Image();          
            img1on.src = "pics/navi/navi_1_on.gif";       // Active Images

            img2on = new Image();
			img2on.src = "pics/navi/navi_2_on.gif";

            img3on = new Image();
			img3on.src = "pics/navi/navi_3_on.gif";

            img4on = new Image();
			img4on.src = "pics/navi/navi_4_on.gif";
			
			img5on = new Image();
			img5on.src = "pics/navi/navi_5_on.gif";
			
			
            img1off = new Image();         
            img1off.src = "pics/navi/navi_1.gif";     // Inactive Images

            img2off = new Image();
			img2off.src = "pics/navi/navi_2.gif";

            img3off = new Image();
			img3off.src = "pics/navi/navi_3.gif";

            img4off = new Image();
			img4off.src = "pics/navi/navi_4.gif";
			
			img5off = new Image();
			img5off.src = "pics/navi/navi_5.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");
        }
}