function changeTab(formName, tabName) {
  var form = document.getElementById(formName);
  form.action = form.action.replace("TABNAAM", tabName);
  form.submit();
}

function developmentToggleVisible(id) {
  var div = document.getElementById(id);
  if (div.developmentToggleVisibleState) {
    div.developmentToggleVisibleState = false;
    div.style.display="none";
  } else {
    div.developmentToggleVisibleState = true;
    div.style.display="block";
  }		
}