if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "images/a_home_on.gif"; 
            img2on = new Image();      
            img2on.src = "images/a_ourservices_on.gif"; 
            img3on = new Image();      
            img3on.src = "images/a_jobvacancy_on.gif"; 
            img4on = new Image();      
            img4on.src = "images/a_jobseeker_on.gif"; 
            img5on = new Image();      
            img5on.src = "images/a_client_on.gif"; 
            img6on = new Image();      
            img6on.src = "images/a_about_on.gif"; 
            img7on = new Image();      
            img7on.src = "images/a_contact_on.gif"; 
            

            img1off = new Image();      
            img1off.src = "images/a_home_of.gif"; 
            img2off = new Image();      
            img2off.src = "images/a_ourservices_of.gif"; 
            img3off = new Image();      
            img3off.src = "images/a_jobvacancy_of.gif"; 
            img4off = new Image();      
            img4off.src = "images/a_jobseeker_of.gif"; 
            img5off = new Image();      
            img5off.src = "images/a_client_of.gif"; 
            img6off = new Image();      
            img6off.src = "images/a_about_of.gif"; 
            img7off = new Image();      
            img7off.src = "images/a_contact_of.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");
        }
}