$(document).ready(function() {

    //stel de hoogte van leftcolumn en contentcolumn op gelijke hoogte
    equalHeight($(".box1"));

    // header image rotate
    $('#slideshow img').show(); //nodig om flickering te vermijden -> images zijn hidden bij default, behalve eerste.
    setInterval("slideSwitch()", 5000);


});



function equalHeight(group) {
    var tallest = 0;
    group.each(function() {
        var thisHeight = $(this).height();
        if (thisHeight > tallest) {
            tallest = thisHeight;
        }
    });
    group.height(tallest);
}

function slideSwitch() {
    var $active = $('#slideshow img.active');

    if ($active.length == 0) $active = $('#slideshow img:last');

    var $next = $active.next().length ? $active.next()
        : $('#slideshow img:first');

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

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