function toggleVisibility(obj)
{
  var el = document.getElementById(obj);
  if (el.style.display != 'none' ) {
    el.style.display = 'none';
  }
  else {
    el.style.display = '';
  }
}

function toggleVisibilityHeader(obj)
{
  var el = document.getElementById(obj);
  var elh = document.getElementById(obj + 'expandcollapse');
  if (el.style.display != 'none' ) {
    el.style.display = 'none';
    elh.innerHTML = '(tonen)';
  }
  else {
    el.style.display = '';
    elh.innerHTML = '(verbergen)';
  }
}

function reactiesAanUit()
{
  var reactiesLijst = document.getElementById('reactieslijst');
  var reactiesAan = document.getElementById('reactiesaan');
  var reactiesUit = document.getElementById('reactiesuit');

  if (reactiesLijst.style.display != 'none')
  {
    reactiesLijst.style.display = 'none';
    reactiesAan.style.display = '';
    reactiesUit.style.display = 'none';
  }
  else
  {
    reactiesLijst.style.display = '';
    reactiesAan.style.display = 'none';
    reactiesUit.style.display = '';
  }
}

function validateRequired(field,alerttxt)
{
  with (field)
  {
    if (value==null||value=="")
    { 
      focus();
      alert(alerttxt);
      return false;
    }
    else 
    { 
      return true;
    }
  }
}

function validateReactie(form)
{
  with (form)
  {
    if (validateRequired(naam, "Naam is niet ingevuld") == false)
    {
       return false;
    }
    if (validateRequired(reactie, "Reactie is niet ingevuld") == false)
    {
       return false;
    }
  }
  return true;
}

function flashObject(container, file, width, height) {
  /*var replacement;

  replacement = '<object type="application/x-shockwave-flash" data="' + file + '" width="' + width + '" height="' + height + '">';
  replacement += '<param name="movie" value="' + file + '" />';
  replacement += '<param name="wmode" value="transparent" />';
  replacement += '<param name="loop" value="0" />';
  replacement += '</object>';

  document.getElementById(container).innerHTML = replacement;*/

  var fo = new FlashObject(file, container, width+"px", height+"px", "8", "#000000");

  fo.addParam("quality", "high");
  fo.addParam("wmode", "transparent");
  fo.addParam("scale", "noscale");
  fo.addParam("menu", "false");
  fo.write(container);

}