if (document.images) {            // Active Images
            image1on = new Image();      
            image1on.src = "/images/about_blue.gif";

            image2on = new Image();      
            image2on.src = "/images/development_blue.gif";
			
            image3on = new Image();      
            image3on.src = "/images/management_blue.gif";
			
            image4on = new Image();      
            image4on.src = "/images/project_blue.gif";
			
            image5on = new Image();      
            image5on.src = "/images/contact_blue.gif";

            image1off = new Image(); 
            image1off.src = "/images/about.gif";

            image2off = new Image(); 
            image2off.src = "/images/development.gif";
			
			image3off = new Image(); 
            image3off.src = "/images/management.gif";
			
			image4off = new Image(); 
            image4off.src = "/images/project.gif";
			
			image5off = new Image(); 
            image5off.src = "/images/contact.gif";
        }

// Function to 'activate' images.
function imageOn(imageName) {
        if (document.images) {
            document[imageName].src = eval(imageName + "on.src");
        }
}

// Function to 'deactivate' images.
function imageOff(imageName) {
        if (document.images) {
            document[imageName].src = eval(imageName + "off.src");
        }
}