if (document.images)   {
     bronzon = new Image();
     bronzon.src="/images/buttons/en/bronz_active.png";
     bronzoff = new Image();
     bronzoff.src = "/images/buttons/en/bronz_inactive.png";

     drevoon = new Image();
     drevoon.src="/images/buttons/en/drevo_active.png";
     drevooff = new Image();
     drevooff.src = "/images/buttons/en/drevo_inactive.png";

     kamenon = new Image();
     kamenon.src="/images/buttons/en/kamen_active.png";
     kamenoff = new Image();
     kamenoff.src = "/images/buttons/en/kamen_inactive.png";

     keramikaon = new Image();
     keramikaon.src="/images/buttons/en/keramika_active.png";
     keramikaoff = new Image();
     keramikaoff.src = "/images/buttons/en/keramika_inactive.png";

     o_autorovion = new Image();
     o_autorovion.src="/images/buttons/en/o_autorovi_active.png";
     o_autorovioff = new Image();
     o_autorovioff.src = "/images/buttons/en/o_autorovi_inactive.png";

     uvodon = new Image();
     uvodon.src="/images/buttons/en/uvod_active.png";
     uvodoff = new Image();
     uvodoff.src = "/images/buttons/en/uvod_inactive.png";


}

function turnOn(imageName)   {
     if (document.images)   {
     document[imageName].src = eval(imageName + "on.src");
     }
}

function turnOff(imageName)   {
     if (document.images)   {
     document[imageName].src = eval(imageName + "off.src");
     }
}