function roll_over(img_name, img_src)
{
   document[img_name].src = 'images/'+img_src;
}
function otworz(adres) {
noweOkno = window.open(adres, 'okienko', 'menubar=no, toolbar=no, location=no, scrollbars=no, resizable=no, status=no, width=880, height=660')
}