Put a container in a column give it the class slide-container and make the position relative
ADD the ID slideshow to it
Put in that container say 4 pictures
ADD the class slide-div on each picture and make them max-width 100% (or whatever)
Then when you are ready make that slide-div class absolute in position
That will make them all be on top of each other,
make it static to change anything and then back to absolute
Put this script in the footer and preview...
$("#slideshow > div:gt(0)").hide();
setInterval(function() {
$('#slideshow > div:first')
.fadeOut(1000)
.next()
.fadeIn(1000)
.end()
.appendTo('#slideshow');
}, 3000);
</script>
*POOF* slideshow