fixed slider

// old function
$('.slideshow-timeline a').click(function() {
    var target_id = $(this).attr('href');
    removeClasses();
    $($(".tour-panel")[current]).addClass("fadeOutRight");
    setTimeout(function() {
        $(target_id).addClass("active-tour fadeInLeft");
    }, 50);
    setTimeout(function() {
        $($(".tour-panel")[current]).removeClass("fadeOutRight");
    }, 750);
    current = target_id.split('-')[1] || 0;
});

// new function
  $('.slideshow-timeline a').click(function() {
    var target_id = $(this).attr('href');
    removeClasses();
    $($(".tour-panel")[current]).addClass("fadeOutLeft");
    current = parseInt(target_id.split('-')[1]) || 0;           // change here
    setTimeout(function() {
      $($(".tour-panel")[current]).addClass("active-tour fadeInRight");
    }, 50);
    // ################################
    // this part wasn't essentially necessary, but you can uncomment it if you need/want it
    /*
    setTimeout(function() {
      $($(".tour-panel")[previousIndex()]).removeClass("active-tour fadeOutLeft");
    }, 750);
    */
  });