function on(elem) {
eval("document.getElementById('" + elem + "').style.background='#0F71F2'");
eval("document.getElementById('" + elem + "').style.color='#ffffff'");
}
function off(elem1) {
eval("document.getElementById('" + elem1 + "').style.background='#1b1b1b'");
eval("document.getElementById('" + elem1 + "').style.color='#ffffff'");
}
function show_blok(layer, elem_to_on, elem_to_off) {
on(elem_to_on);
off(elem_to_off);
document.getElementById('car_opis_blok').style.visibility='hidden';
document.getElementById('car_opis_blok').style.position='absolute';
document.getElementById('car_tarif_blok').style.visibility='hidden';
document.getElementById('car_tarif_blok').style.position='absolute';
eval("document.getElementById('" + layer + "').style.visibility='visible'");
eval("document.getElementById('" + layer + "').style.position='static'");
}