我想组合两个拖动的效果，现在把左边的内容可以拖到右边，但是右边的内容没办法拖回来，到左边边界就看不见了，麻烦大侠帮我看看是怎么回事，谢谢啦
http://pan.baidu.com/s/1eQZNUTG
关于拖动的，直接使用jQ的插件，很方便，或看html5的api。
.drop-area 样式
去掉以下两个。
overflow-y: auto;
overflow-x: hidden;
去掉样式果然有用，但是右侧不能滚动了，有的必有失啊，，谢谢大侠啦
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