function slideSwitch(switchSpeed) {
    var $active = $('#slideshow img.active');
    if ( $active.length == 0 ) $active = $('#slideshow img:last');
    var $next =  $active.next('img').length ? $active.next('img')
        : $('#slideshow img:first');
    $active.addClass('last-active');
    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, switchSpeed, function() {
            $active.removeClass('active last-active');
        });
}

$(document).ready(function(){
	$(function() {
    	setInterval ( "slideSwitch(1000)", 5000 );    
	});
});