if (document.images) {  

image1on = new Image();  
image1on.src = "images/menu/home_on.jpg";  

image2on = new Image();  
image2on.src = "images/menu/about_on.jpg";  

image3on = new Image();  
image3on.src = "images/menu/products_on.jpg";  

image4on = new Image();  
image4on.src = "images/menu/faq_on.jpg";

image5on = new Image();  
image5on.src = "images/menu/contact_on.jpg";  

image6on = new Image();  
image6on.src = "images/menu/references_on.jpg";  

image7on = new Image();  
image7on.src = "images/menu/future_on.jpg";  

image1off = new Image();  
image1off.src = "images/menu/home_off.jpg";  

image2off = new Image();  
image2off.src = "images/menu/about_off.jpg";  

image3off = new Image();  
image3off.src = "images/menu/products_off.jpg";  

image4off = new Image();  
image4off.src = "images/menu/faq_off.jpg";

image5off = new Image();  
image5off.src = "images/menu/contact_off.jpg";

image6off = new Image();  
image6off.src = "images/menu/references_off.jpg";

image7off = new Image();  
image7off.src = "images/menu/future_off.jpg";

}

function changeImages() {

  if (document.images) {

    for (var i=0; i<changeImages.arguments.length; i+=2) {

      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");

    }

  }

}