var NN3 = false;

image1= new Image();
image1.src = "images/reference_b.jpg";
image1on = new Image();
image1on.src = "images/reference_o.jpg";

image2= new Image();
image2.src = "images/sluzby_b.jpg";
image2on = new Image();
image2on.src = "images/sluzby_o.jpg";

image3= new Image();
image3.src = "images/profil_b.jpg";
image3on = new Image();
image3on.src = "images/profil_o.jpg";

image4= new Image();
image4.src = "images/kontakt_b.jpg";
image4on = new Image();
image4on.src = "images/kontakt_o.jpg";



function on3(name)   {
        document[name].src = eval(name + "on.src");
}
function off3(name)  {
        document[name].src = eval(name + ".src");
}
NN3 = true;

function on(name)  {
        if (NN3) on3(name);
}
function off(name)  {
        if (NN3) off3(name);
}
// -->