var imgTag;

function showImage(imgTag) {
    if(imgTag == 'main') {
        document.getElementById("mainImg").src = "images/menu/gr_home.jpg";
    } else if(imgTag == 'slok') {
        document.getElementById("slokImg").src = "images/menu/gr_slok.jpg";
    } else if(imgTag == 'photo') {
        document.getElementById("fotoImg").src = "images/menu/gr_foto.jpg";
    } else if(imgTag == 'route') {
        document.getElementById("routeImg").src = "images/menu/gr_toute.jpg";
    }
}

function hideImage(imgTag) {
    if(imgTag == 'main') {
        document.getElementById("mainImg").src = "images/menu/kl_home.jpg";
    } else if(imgTag == 'slok') {
        document.getElementById("slokImg").src = "images/menu/kl_slok.jpg";
    } else if(imgTag == 'photo') {
        document.getElementById("fotoImg").src = "images/menu/kl_foto.jpg";
    } else if(imgTag == 'route') {
        document.getElementById("routeImg").src = "images/menu/kl_route.jpg";
    }
}