<!--

  function obj(el)
  {
    var obj = document.getElementById(el);
    return obj;
  }

  function prijs()
  {
    switch (obj("s1").value)
    {
      case "1":
        obj("td11").innerHTML = "&euro; 3";
	    obj("td12").innerHTML = "&euro; 6";
        obj("td13").innerHTML = "&euro; 12";
        obj("td14").innerHTML = "&euro; 18";
        obj("td15").innerHTML = "&euro; 24";
        break;
      case "2":
        obj("td11").innerHTML = "&euro; 36";
        obj("td12").innerHTML = "&euro; 72";
        obj("td13").innerHTML = "&euro; 144";
        obj("td14").innerHTML = "&euro; 216";
        obj("td15").innerHTML = "&euro; 288";
        break;
    }
  }

  name = navigator.appName;
  version = navigator.appVersion.substr(0,1);

  dom = false;

  if (name == 'Netscape')
  {
    if (version >= 5) dom = true;
  }
  else if (name == 'Microsoft Internet Explorer')
  {
    if (version >= 4) dom = true;
  }  

  if (dom)
  {
    obj("td10").innerHTML = '<select onclick="prijs();" onchange="prijs();" id="s1"><option value="1" selected>Kosten per maand<option value="2">Kosten per jaar</select>';
  }

// -->
