$(document).ready(function() {
  $('div.vragen h2').click(function() {
    $(this).toggleClass('expanded').next('p').slideToggle();
  });
  
  if ($('div#leerling div').length) {
    setInterval( "slideSwitch()", 10000 );
  }
  
  $('div.slideshow').slideshow();
});

function slideSwitch() {
    var $active = $('#leerling div.active');
    var $next = $active.next('div');

    if ( $active.length == 0 ) $active = $('#leerling div:last');
    var $next =  $active.next('div').length ? $active.next('div') : $('#leerling div:first');

    $active.addClass('last-active');

    $next.css({opacity: 0.0})
         .addClass('active')
         .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
          });
}