if (document.images) {
  image1on = new Image();
  image1on.src = "/images/icon_about_on.gif";
  image2on = new Image();
  image2on.src = "/images/icon_method_on.gif";
  image3on = new Image();
  image3on.src = "/images/i-product-on.gif";
  image4on = new Image();
  image4on.src = "/images/icon_partners_on.gif";
  image5on = new Image();
  image5on.src = "/images/i-contacts-on.gif";
  
  image6on = new Image();
  image6on.src = "/images/i-ECs-on.gif";  
  image7on = new Image();
  image7on.src = "/images/i-GCs-on.gif";    
  image8on = new Image();
  image8on.src = "/images/i-AnEs-on.gif";   
  image9on = new Image();
  image9on.src = "/images/i-green-on_b.gif";  
  image10on = new Image();
  image10on.src = "/images/i-legal-on.gif";  
  image11on = new Image();
  image11on.src = "/images/i-testimonials-on.gif";  
  image12on = new Image();
  image12on.src = "/images/i-links-on.gif";  
  
  image1off = new Image();
  image1off.src = "/images/icon_about.gif";
  image2off = new Image();
  image2off.src = "/images/icon_method.gif";
  image3off = new Image();
  image3off.src = "/images/i-product-off.gif";
  image4off = new Image();
  image4off.src = "/images/icon_partners.gif";
  image5off = new Image();
  image5off.src = "/images/i-contacts-off.gif";
  
  image6off = new Image();
  image6off.src = "/images/i-ECs-off.gif";  
  image7off = new Image();
  image7off.src = "/images/i-GCs-off.gif";    
  image8off = new Image();
  image8off.src = "/images/i-AnEs-off.gif";  
  image9off = new Image();
  image9off.src = "/images/i-green-off.gif";  
  image10off = new Image();
  image10off.src = "/images/i-legal-off.gif";  
  image11off = new Image();
  image11off.src = "/images/i-testimonials-off.gif";  
  image12off = new Image();
  image12off.src = "/images/i-links-off.gif";  
  
}
function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "on.src");
  }
}
function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "off.src");
  }
}