if (document.images) {            // Active Images
  img1on = new Image();      
  img1on.src = "images/AdvancedTooling-new-slic-22-rollover.jpg";  
  
  img2on = new Image();      
  img2on.src = "images/MenuLinkAboutUs-rollover.jpg";
  
  img3on = new Image();      
  img3on.src = "images/MenuLinkServices-rollover.jpg";
  
  img4on = new Image();      
  img4on.src = "images/MenuLinkProducts-rollover.jpg";
  
  img5on = new Image();      
  img5on.src = "images/MenuLinkOurClients-rollover.jpg";
  
  img6on = new Image();      
  img6on.src = "images/MenuLinkContactUS-rollover.jpg"; 
          
  img1off = new Image(); 
  img1off.src = "images/AdvancedTooling-new-slic-22.jpg";  
  
  img2off = new Image(); 
  img2off.src = "images/MenuLinkAboutUs.jpg";  
  
  img3off = new Image(); 
  img3off.src = "images/MenuLinkServices.jpg";
  
  img4off = new Image(); 
  img4off.src = "images/MenuLinkProducts.jpg";
  
  img5off = new Image(); 
  img5off.src = "images/MenuLinkOurClients.jpg";
  
  img6off = new Image(); 
  img6off.src = "images/MenuLinkContactUS.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");
        }
}