function UnCheck(ide){
  if(document.getElementById(ide)){
    if(document.getElementById(ide).checked) document.getElementById(ide).checked = false;
    else document.getElementById(ide).checked = true;
  }
}
function CheckInverze(pocch){
  for(i = 0 ; i < pocch ; i++){
    var ide = "ch"+i;
    UnCheck(ide);
  }
}