function reload_page() {
    if (String(document.location).indexOf('?') < 0) {
        document.location = document.location + '?cache=reset';
    }
    else {
        document.location = document.location + '&cache=reset';
    }
}

$(document).ready( function() {
    $("a.related_box").fancybox({
        'overlayShow': true,
        'on_close': reload_page,
        'frameWidth': $(window).width() - 20,
        'frameHeight': $(window).height()
    });
});