function init_dest(formul, firBox, secBox) {
  optionTest = true;
  lgth = formul.elements[secBox].options.length;
  formul.elements[secBox].options[lgth] = null;
  if(formul.elements[secBox].options[lgth]) optionTest = false;
}

function populate_dest(formul, firBox, secBox) {
  if (!optionTest) return;
  var box = formul.elements[firBox];
  var number = box.options[box.selectedIndex].value;
  if (!number) return;
  var list = store[number];
  var box2 = formul.elements[secBox];
  box2.options.length = 0;
  for(i=0;i<list.length;i+=2) {
    box2.options[i/2] = new Option(list[i],list[i+1]);
  }
}