if (document.images) {
        button1on = new Image();
        button1on.src = "images/en_menu_o_nas_on.jpg";
        button1off = new Image();
        button1off.src = "images/en_menu_o_nas.jpg";
        button2on = new Image();
        button2on.src = "images/en_menu_akcie_on.jpg";
        button2off = new Image();
        button2off.src = "images/en_menu_akcie.jpg";
        button3on = new Image();
        button3on.src = "images/en_menu_novinky_on.jpg";
        button3off = new Image();
        button3off.src = "images/en_menu_novinky.jpg";
        button4on = new Image();
        button4on.src = "images/en_menu_katalog_on.jpg";
        button4off = new Image();
        button4off.src = "images/en_menu_katalog.jpg";
        button5on = new Image();
        button5on.src = "images/en_menu_cennik_on.jpg";
        button5off = new Image();
        button5off.src = "images/en_menu_cennik.jpg";
        button6on = new Image();
        button6on.src = "images/en_menu_kontakt_on.jpg";
        button6off = new Image();
        button6off.src = "images/en_menu_kontakt.jpg";
        button7on = new Image();
        button7on.src = "images/en_menu_irbal_on.jpg";
        button7off = new Image();
        button7off.src = "images/en_menu_irbal.jpg";
        }
        function img_act(imgname)  {
     if (document.images)   {
          imgon = eval(imgname + "on.src");
          document [imgname].src = imgon;
     }
}
                function img_inact(imgname)   {
     if (document.images) {
          imgoff = eval(imgname + "off.src");
          document [imgname].src = imgoff;
     }
}

//JavaScript Document - LEFT MENU by ERICH PAUKO