function zmiana(nazwa,sciezka) {
document[nazwa].src=sciezka;
}
image1 = new Image();
image1.src = "images/o_firmie_l.gif";
image2 = new Image();
image2.src = "images/uslugi_l.gif";
image3 = new Image();
image3.src = "images/cennik_l.gif";
image4 = new Image();
image4.src = "images/kontakt_l.gif";
image5 = new Image();
image5.src = "images/dla_firm_l.gif";