$(document).ready(function () {
    // start slideshow
    if ($('#slideshow img').length > 1) {
        startSlideSwitch(true);
    }
    else {
        startSlideSwitch(false);
    }
});

function slideSwitch() {
    var $active = $('#slideshow img.active');
    
    if ( $active.length == 0 ) $active = $('#slideshow img:last');

    // use this to pull the images in the order they appear in the markup
    var $next =  $active.next().length ? $active.next()
        : $('#slideshow img:first');

    // uncomment the 3 lines below to pull the images in random order
    
    // var $sibs  = $active.siblings();
    // var rndNum = Math.floor(Math.random() * $sibs.length );
    // var $next  = $( $sibs[ rndNum ] );


    $active.addClass('last-active');

    $next.css({ opacity: 0.0 })
        .removeClass('hidden')
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
    }

    function startSlideSwitch(multipleImages) {

        var $first = $('#slideshow img.first');
        $first.css({ opacity: 0.0 });
        $first.removeClass('hidden');

        $first.addClass('active')
        .animate({ opacity: 1.0 }, 1000, function () {
            $first.removeClass('first');
        });

        if (multipleImages) setInterval('slideSwitch()', 5000);
    }