$(document).ready(function() {
	$('.slide:first-child').addClass("active");
    setInterval( "slideSwitch()", 4000 );
});

function slideSwitch() {
 
    var $active = $('.active');
 
    if ( $active.length == 0 ) $active = $('.slide:last');
 
    // use this to pull the images in the order they appear in the markup
    var $next =  $active.next().length ? $active.next()
        : $('.slide:first'); 
 
    $active.addClass('last-active');
 
    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}