if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "graphics/nav1_on.jpg";
			
			img2on = new Image();      
            img2on.src = "graphics/nav2_on.jpg";
			
			img3on = new Image();      
            img3on.src = "graphics/nav3_on.jpg";
			
			img4on = new Image();      
            img4on.src = "graphics/nav4_on.jpg";
			
			img5on = new Image();      
            img5on.src = "graphics/nav5_on.jpg";
			
			img13on = new Image();      
            img13on.src = "graphics/nav13_on.jpg";
			
			img6on = new Image();      
            img6on.src = "graphics/nav6_on.jpg";
			
			img7on = new Image();      
            img7on.src = "graphics/nav7_on.jpg";
			
			img8on = new Image();      
            img8on.src = "graphics/nav8_on.jpg";
			
			img9on = new Image();      
            img9on.src = "graphics/nav9_on.jpg";
			
			img10on = new Image();      
            img10on.src = "graphics/nav10_on.jpg";
			
			img11on = new Image();      
            img11on.src = "graphics/nav11_on.jpg";
			
			img12on = new Image();      
            img12on.src = "graphics/nav12_on.jpg";
			
			

            img1off = new Image(); 
            img1off.src = "graphics/nav1_off.jpg"; 		

            img2off = new Image(); 
            img2off.src = "graphics/nav2_off.jpg";
			
			img3off = new Image(); 
            img3off.src = "graphics/nav3_off.jpg";
			
			img4off = new Image(); 
            img4off.src = "graphics/nav4_off.jpg";
			
			img5off = new Image(); 
            img5off.src = "graphics/nav5_off.jpg";
			
			img13off = new Image(); 
            img13off.src = "graphics/nav13_off.jpg";
			
			img6off = new Image(); 
            img6off.src = "graphics/nav6_off.jpg";
			
			img7off = new Image(); 
            img7off.src = "graphics/nav7_off.jpg";
			
			img8off = new Image(); 
            img8off.src = "graphics/nav8_off.jpg";
			
			img9off = new Image(); 
            img9off.src = "graphics/nav9_off.jpg";
			
			img10off = new Image(); 
            img10off.src = "graphics/nav10_off.jpg";
			
			img11off = new Image(); 
            img11off.src = "graphics/nav11_off.jpg";
			
			img12off = new Image(); 
            img12off.src = "graphics/nav12_off.jpg";
			 }

// 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");
        }
}