function question_set_type(t)
{
    if (document.getElementById('openanswer'))
    {
        if (t == 0 || t == 2 || t == 4)
        {
            // met open antwoord
            document.getElementById('openanswer').style.display = 'block';
        }
        else
        {
            // antwoorden
            document.getElementById('openanswer').style.display = 'none';
        }
    }

    if (document.getElementById('answers'))
    {
        if (t > 0)
        {
            document.getElementById('answers').style.display = 'block';
        }
        else
        {
            document.getElementById('answers').style.display = 'none';
        }
    }

    if (document.getElementById('maxanswers'))
    {
            if (t == 3 || t == 4)
        {
            document.getElementById('maxanswers').style.display = 'block';
        }
        else
        {
            document.getElementById('maxanswers').style.display = 'none';
        }
    }


    if (document.getElementById('matrix'))
    {
        if (t == 5)
        {
            document.getElementById('matrix').style.display = 'block';
        }
        else
        {
            document.getElementById('matrix').style.display = 'none';
        }
    }
}

function createList(box, from, to)
{
   var select = document.getElementById(box); // was parent
   //var select = parent.appendChild(document.createElement('select'));
   for (var i = from; i < (to +1); ++i)
   {
      var option = document.createElement('option');
      option.value = i;
      option.text = i;
      select.options.add(option);
   }
}

old = 'teksten';
function xMenu(open)
{
    if (old != open)
    {
        d = document.getElementById(open);

        if (d ||
            d.style.display == 'none' ||
            d.style.display == '')
        {
            d.style.display = 'block';

            if (document.getElementById('menuoption')) 
            {
                document.getElementById('menuoption').value = open;
            }

            if (old != '')
            {
                document.getElementById(old).style.display = 'none';
            }

            old = open;
        }
    }
}

// footer adsense
function adBox()
{
    contentSize = 850;

    midden = ((document.documentElement['offsetWidth'] -2)/2 - 80);

    document.getElementById('centerrechts').style.left    = ((document.documentElement['offsetWidth']/2) + (contentSize /2)) + "px";
    document.getElementById('centerrechts').style.display = 'block';
}


function addEvent( obj, type, fn )
{
   if (obj.addEventListener)
      obj.addEventListener( type, fn, false );
   else if (obj.attachEvent)
   {
      obj["e"+type+fn] = fn;
      obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
      obj.attachEvent( "on"+type, obj[type+fn] );
   }
}