如果你必须重新发明轮子，这里有一个简单的例子：
http://jsfiddle.net/KDnPX/
Html：

<img src="">
    <a href="#" class="prevImg">Previous</a>
    <a href="#" class="nextImg">Next</a>

Jquery：

var json = '{"0":"http://mw2.google.com/mw-panoramio/photos/medium/14748463.jpg", 
"1":"http://mw2.google.com/mw-panoramio/photos/medium/3840183.jpg", 
"2":"http://mw2.google.com/mw-panoramio/photos/medium/25214140.jpg"}';

var images = jQuery.parseJSON(json);

// load first image
$('img').attr('src', images[0]);

var currImg = 0;

$('.prevImg').click(function (){
    if (currImg - 1 >= 0)
    {
        // show previous image
        $('img').attr('src', images[currImg - 1]);
        currImg--;
    }
    return false;
});

$('.nextImg').click(function (){
    if (currImg + 1 < Object.keys(images).length)
    {
        // show previous image
        $('img').attr('src', images[currImg + 1]);
        currImg++;
    }
    return false;
});