效果图:
[img]http://dl2.iteye.com/upload/attachment/0097/4369/b6ea877c-fe7b-3e9a-9380-6607e1c3ca71.jpg[/img]
[img]http://dl2.iteye.com/upload/attachment/0097/4371/6fdd2c3f-e090-3a5c-ac3a-946c3f76f489.jpg[/img]

直接下代码吧。