$(function() {
    if($('#slide-show li').length) {
        runSlideShow();
        var slideShowTimer = setInterval("runSlideShow()", 4200);
    }
});
function runSlideShow() {
    if(!$('#slide-show li.active').length) {
        $('#slide-show li:last').addClass('active');
    }
    if(!$('#slide-show li.active').next('li').length) {
        var nextSlide = $('#slide-show li:first');
    } else {
        var nextSlide = $('#slide-show li.active').next('li');
    }
    $('#slide-show li.active').fadeOut('slow', function() {
        $(this).removeClass('active');
        $(nextSlide).addClass('active').fadeIn('slow');
    });
}