function nextSlide( fade ) {
  var $active = $('#slides .slide.active');
  $active.fadeOut( fade ).removeClass( 'active' );
  var $next = $active.next();
  if ( $next.length == 0 )
    $next = $('#slides .slide:first');
  $next.fadeIn( fade ).addClass( 'active' );
}
$(function() {
  var wait  = 5000;
  var fade  = 2000;
  $('#slides .slide').hide();
  nextSlide( fade );
  setInterval( "nextSlide(" + fade + ")", wait );
});