<script type="text/javascript">
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: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}

$(function() {
    setInterval( "slideSwitch()", 3000 );
});

</script>

		

#slideshow {
    position:relative;
    height:350px;
}

#slideshow IMG {
    position:absolute;
    top:0;
    left:0;
    z-index:8;
}

#slideshow IMG.active {
    z-index:10;
}

#slideshow IMG.last-active {
    z-index:9;
}
		

<div id="slideshow">
	<img src="images/jack1.jpg" alt="" class="active" />
	<img src="images/jack2.jpg" alt="" />
	<img src="images/jack3.jpg" alt="" />
	<img src="images/jack4.jpg" alt="" />
</div>