homeon = new Image();                    
homeon.src = "images/home_on.gif";
homeoff = new Image();
homeoff.src = "images/home_off.gif";

serviceson = new Image();                    
serviceson.src = "images/services_on.gif";
servicesoff = new Image();
servicesoff.src = "images/services_off.gif";

sitterson = new Image();                    
sitterson.src = "images/sitters_on.gif";
sittersoff = new Image();
sittersoff.src = "images/sitters_off.gif";

testimonialson = new Image();                    
testimonialson.src = "images/testimonials_on.gif";
testimonialsoff = new Image();
testimonialsoff.src = "images/testimonials_off.gif";

galleryon = new Image();                    
galleryon.src = "images/gallery_on.gif";
galleryoff = new Image();
galleryoff.src = "images/gallery_off.gif";

clientson = new Image();                    
clientson.src = "images/clients_on.gif";
clientsoff = new Image();
clientsoff.src = "images/clients_off.gif";

reservationson = new Image();                    
reservationson.src = "images/reservations_on.gif";
reservationsoff = new Image();
reservationsoff.src = "images/reservations_off.gif";

contacton = new Image();                    
contacton.src = "images/contact_on.gif";
contactoff = new Image();
contactoff.src = "images/contact_off.gif";

// On function
function imgAct(imgName) {
    document[imgName].src = eval(imgName + "on.src");
}

// Off function
function imgInact(imgName) {
    document[imgName].src = eval(imgName + "off.src");
}