Div + css implemented sliding door, concise, novice on the road (small pigeon Series)

I used to reply to several friends about the sliding door code. At that time, I didn't use IE7 or FF. As a result, I found that the code can only be run under IE6, and the code is also very long; today, another friend asked me this question. I had to spend some time and finally finished this stuff. I hope everyone will like it;
Compatible with IE7; FF; IE6
Code is simpler and easier to read; Xmlns = "http://www.w3.org/1999/xhtml">

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