function autoBlender(useElement, animSpeed) {
  var $alt = jQuery(useElement + '.first');

  if($alt.next().length)
    var $neu = $alt.next();
  else
    var $neu = jQuery(useElement + ':first');

  $alt.addClass('second');
  $alt.removeClass('first');
  $neu.css({opacity: 0.0});
  $neu.addClass('first');

  $neu.animate({opacity: 1.0}, animSpeed, function() {
    $alt.removeClass('second');
  });
}