function setVisible() {
  var f = document.forms.roofform;
  var l1 = document.getElementById('ul1');
  var l2 = document.getElementById('ul2');
  var l3 = document.getElementById('ul3');
  var l4 = document.getElementById('ul4');
  var l5 = document.getElementById('ul5');
  var l6 = document.getElementById('ul6');

  if (true == f.pr1.checked){
    l1.style.visibility = 'visible';
    l1.style.display = 'block';
  } else {
    l1.style.visibility = 'hidden';
    l1.style.display = 'none';
  }

  if (true == f.pr2.checked){
    l2.style.visibility = 'visible';
    l2.style.display = 'block';
  } else {
    l2.style.visibility = 'hidden';
    l2.style.display = 'none';
  }

  if (true == f.pr3.checked){
    l3.style.visibility = 'visible';
    l3.style.display = 'block';
  } else {
    l3.style.visibility = 'hidden';
    l3.style.display = 'none';
  }

  if (true == f.pr4.checked){
    l4.style.visibility = 'visible';
    l4.style.display = 'block';
  } else {
    l4.style.visibility = 'hidden';
    l4.style.display = 'none';
  }

  if (true == f.pr5.checked){
    l5.style.visibility = 'visible';
    l5.style.display = 'block';
  } else {
    l5.style.visibility = 'hidden';
    l5.style.display = 'none';
  }

  if (true == f.pr6.checked){
    l6.style.visibility = 'visible';
    l6.style.display = 'block';
  } else {
    l6.style.visibility = 'hidden';
    l6.style.display = 'none';
  }
}