img1on = new Image(); img1on.src = "en_ofirmie1.gif";
img1off = new Image(); img1off.src = "en_ofirmie0.gif";

img2on = new Image(); img2on.src = "en_oferta1.gif";
img2off = new Image(); img2off.src = "en_oferta0.gif";

img3on = new Image(); img3on.src = "en_kontakt1.gif";
img3off = new Image(); img3off.src = "en_kontakt0.gif";

function img_act(imgName) {imgOn = eval(imgName + "on.src"); document [imgName].src = imgOn;}
function img_inact(imgName) {imgOff = eval(imgName + "off.src"); document [imgName].src = imgOff;}
function aktive(numer) {
if (numer==1) { img_act("img1") }; if (numer==101) { img_inact("img1") };
if (numer==2) { img_act("img2") }; if (numer==102) { img_inact("img2") };	
if (numer==3) { img_act("img3") }; if (numer==103) { img_inact("img3") };
}