if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "images/nav_why_on.gif"; 
            img2on = new Image(); 
            img2on.src = "images/nav_benefits_on.gif";  
            img3on = new Image();
            img3on.src = "images/nav_outlook_on.gif";
            img4on = new Image();
            img4on.src = "images/nav_bottom_line_on.gif";
            img5on = new Image();
            img5on.src = "images/nav_getting_started_on.gif";
            

			
            img1off = new Image(); 
            img1off.src = "images/nav_why.gif"; 
            img2off = new Image();          
            img2off.src = "images/nav_benefits.gif"; 
            img3off = new Image();
            img3off.src = "images/nav_outlook.gif";
            img4off = new Image();
            img4off.src = "images/nav_bottom_line.gif";
            img5off = new Image();
            img5off.src = "images/nav_getting_started.gif";
            
            
        }

// 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");
        }
}