var clicked = false;
function klikVerder() {
  if (!clicked)
  { 
    document.getElementById('meer').innerHTML = '« Verberg formulier    '; 
    document.getElementById('hide').style.display='block'; clicked = true; 
  }
  else
  { 
    document.getElementById('meer').innerHTML = 'Open formulier: »    '; 
    document.getElementById('hide').style.display='none'; clicked = false;
  } 
}