function show(object) {
  document.getElementById(object).style.visibility = 'visible';
}
function hide(object) {
  document.getElementById(object).style.visibility = 'hidden';
}
function showsub(object1,object2) {
  document.getElementById(object1).style.visibility = 'visible';
  document.getElementById(object2).style.visibility = 'visible';
}
function hidesub(object1,object2) {
  document.getElementById(object1).style.visibility = 'hidden';
  document.getElementById(object2).style.visibility = 'hidden';
}