<!-- layers that slide go here.
Be sure to include id for each layer in style sheet in head -->
<br/><br/>固定Div,且scroll时Div不闪动。
<br/><br/>部分代码来自:http://www.javalobby.org/forums/thread.jspa?threadID=16484&tstart=0
<br/><br/>(注:这里有<a href="DivFixedInBody1.htm">scroll时Div闪动</a>的代码)
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