效果页面~ html代码如下:

<div class="ad">
    <a href="" target="_blank"><img src="01.jpg"  /></a>
    <a href="" target="_blank"><img src="02.jpg"  /></a>
    <a href="" target="_blank"><img src="03.jpg"  /></a>
</div>

jquery代码如下:

<script>
    function swapImages(){
        var $active = $('.ad .active');
        var $next = ($('.ad .active').next().length > 0) ? $('.ad .active').next() : $('.ad a:first');
        $active.fadeOut(function(){
        $active.removeClass('active');
        $next.fadeIn().addClass('active');
        });
    }

    $(document).ready(function(){
        $('.ad a:first').addClass('active');
          // Run our swapImages() function every 3secs
          setInterval('swapImages()', 3000);
    });
</script>

CSS代码如下:

.ad a{
    display:none;
}
.ad .active{
    display:block;
}