if (document.images) 
{  //---if browser doesn't support images, skips initializing variables

img1on = new Image();
img1on.src = "image/home_l.jpg";

img1off = new Image();
img1off.src = "image/home.jpg";

img2on = new Image();
img2on.src = "image/promocje_l.jpg";

img2off = new Image();
img2off.src = "image/promocje.jpg";

img3on = new Image();
img3on.src = "image/oferta_l.jpg";

img3off = new Image();
img3off.src = "image/oferta.jpg";

img4on = new Image();
img4on.src = "image/zamowienia_l.jpg";

img4off = new Image();
img4off.src = "image/zamowienia.jpg";

img5on = new Image();
img5on.src = "image/feedback_l.jpg";

img5off = new Image();
img5off.src = "image/feedback.jpg";

img6on = new Image();
img6on.src = "image/kontakt_l.jpg";

img6off = new Image();
img6off.src = "image/kontakt.jpg";

}

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

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