手风琴特效

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    <div id="d5" style="width:500px; height:300px; position:absolute; float:left; left:200px; transition:0.7s;" onMouseOver="bian(5)"></div>
</div>
<br>
<div style=" width:700px; height:300px;  overflow:hidden;position:relative;">
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    <div id="dd4" style="width:500px; height:300px; position:absolute; float:left; left:150px; transition:0.7s;" onClick="biann(4)"></div>
    <div id="dd5" style="width:500px; height:300px; position:absolute; float:left; left:200px; transition:0.7s;" onClick="biann(5)"></div>
</div><br>

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