This extension can be used to create collapsable frame. Image talks more.
[http://p.blog.csdn.net/images/p_blog_csdn_net/mzgcoco/EntryImages/20081114/demo1.PNG]
[http://p.blog.csdn.net/images/p_blog_csdn_net/mzgcoco/EntryImages/20081114/demo2_1.PNG]
[http://p.blog.csdn.net/images/p_blog_csdn_net/mzgcoco/EntryImages/20081114/demo2_2.PNG]
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