function showdiv (targetdiv) {
  document.getElementById('turnarounds').style.visibility='hidden';
  document.getElementById('roadwidth').style.visibility='hidden';
  document.getElementById('address').style.visibility='hidden';
  document.getElementById('drivewayclearance').style.visibility='hidden';
  document.getElementById('turnouts').style.visibility='hidden';
  document.getElementById('streetsigns').style.visibility='hidden';
  document.getElementById('bridges').style.visibility='hidden';
  if (targetdiv) {
    document.getElementById(targetdiv).style.visibility='visible';
  }
}
function showdivcontent (targetdiv){
  document.getElementById('turnarounds').style.visibility='hidden';
  document.getElementById('roadwidth').style.visibility='hidden';
  document.getElementById('address').style.visibility='hidden';
  document.getElementById('drivewayclearance').style.visibility='hidden';
  document.getElementById('turnouts').style.visibility='hidden';
  document.getElementById('streetsigns').style.visibility='hidden';
  document.getElementById('bridges').style.visibility='hidden';
  if (targetdiv) {
    document.getElementById(targetdiv).style.visibility='visible';
  }
}