function swapPage(url){
  document.all.inhoud.src = url + ".html";    
}

function openPopup(url,w,h) {
  var parString = "width=" + w + ",height=" + h + ",toolbar=1,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=1";
  var winPopup = window.open(url,"",parString);
}

function meer(id)
{
  var element = document.getElementById(id);
  if(element.style.display == "")
    element.style.display = "none";
  else
    element.style.display = "";
}