function loadImages()
       {
        if (document.images) {
            imgAbouton = new Image();          
            imgAbouton.src ="./Images/aboutbuttona.png";       // Active Images
            imgServiceson = new Image(); 
            imgServiceson.src ="./Images/servicesbuttona.png";   
            imgReferralson = new Image(); 
            imgReferralson.src ="./Images/referralsbuttona.png";   
            imgLogonon = new Image(); 
            imgLogonon.src ="./Images/logonbuttona.png";
            imgJobson = new Image(); 
            imgJobson.src ="./Images/jobsbuttona.png";   
            imgNewson = new Image(); 
            imgNewson.src ="./Images/newsbuttona.png";
            imgContacton = new Image();
            imgContacton.src ="./Images/contactusbuttona.png";     

            imgAboutoff = new Image();          
            imgAboutoff.src ="./Images/aboutbutton.png";       // Inactive Images
            imgServicesoff = new Image(); 
            imgServicesoff.src ="./Images/servicesbutton.png";   
            imgReferralsoff = new Image(); 
            imgReferralsoff.src ="./Images/referralsbutton.png";   
            imgLogonoff = new Image(); 
            imgLogonoff.src ="./Images/logonbutton.png";
            imgJobsoff = new Image(); 
            imgJobsoff.src ="./Images/jobsbutton.png";   
            imgNewsoff = new Image(); 
            imgNewsoff.src ="./Images/newsbutton.png";
            imgContactoff = new Image();
            imgContactoff.src ="./Images/contactusbutton.png";  
        }
        }

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

}

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

}