function center(sirka, vyska) {
  x = (window.screen.width/2) - (sirka/2 + 10);
  y = (window.screen.height/2) - (vyska/2 + 25);
  window.open("", "center", "width="+sirka+", height="+vyska+", left="+x+", top="+y+", status");
}

function klasik(sirka, vyska) {
  window.open("", "resize", "width="+sirka+", height="+vyska+", left=0, top=0, status");
}

function resize() {
  window.resizeTo(fotka.width+10, fotka.height+48);
}