img1on = new Image();      
img1on.src = "images/e_consult_alt.jpg"; 
img2on = new Image(); 
img2on.src = "images/member_login_alt.jpg";  
img3on = new Image();
img3on.src = "images/about_us_alt.jpg";
img4on = new Image();
img4on.src = "images/services_alt.jpg";
img5on = new Image();
img5on.src = "images/training_alt.jpg";
img6on = new Image();
img6on.src = "images/our_staff_alt.jpg";
img7on = new Image();
img7on.src = "images/benefits_alt.jpg";
img8on = new Image();
img8on.src = "images/clients_alt.jpg";
img9on = new Image();
img9on.src = "images/contact_us_alt.jpg";
img10on = new Image();
img10on.src = "images/home_alt.jpg";
img11on = new Image();
img11on.src = "images/next_step_alt.jpg";

img1off = new Image(); 
img1off.src = "images/e_consult.jpg"; 
img2off = new Image();          
img2off.src = "images/member_login.jpg"; 
img3off = new Image();
img3off.src = "images/about_us.jpg";
img4off = new Image();
img4off.src = "images/services.jpg";
img5off = new Image();
img5off.src = "images/training.jpg";
img6off = new Image();
img6off.src = "images/our_staff.jpg";
img7off = new Image();
img7off.src = "images/benefits.jpg";
img8off = new Image();
img8off.src = "images/clients.jpg";
img9off = new Image();
img9off.src = "images/contact_us.jpg";
img10off = new Image();
img10off.src = "images/home.jpg";
img11off = new Image();
img11off.src = "images/next_step.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");
        }
}