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 } )
  .addClass( 'active' )
  .animate( { opacity: 1 }, 850, function() {
    $active.removeClass( 'active last-active' );
  });
}

$(document).ready( function() {
	if ( $( '#slideshow img').length > 1 ) {
		setTimeout( 'setInterval( "slideSwitch()", 2800 )', 2800 );
	}
});