function otvor (nazov,theURL,wx,wy) {
mx = Math.round((screen.width-wx)/2);
my = Math.round((screen.height-wy)/2)-40;

window.open(theURL,""+nazov+"","width="+wx+",height="+wy+",toolbar=no,directories=no,status=yes,scrollbars=yes,resizable=no,menubar=no,left="+mx+",top="+my+"").focus();
}