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<title>www.knowsky.com</title>
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<h1>将鼠标移至图片，将看到此效果。</h1>
<p id="outer"><a href="http://www.knowsky.com/"><img onMouseOut=low(this) onMouseOver=high(this) style='FILTER: alpha(opacity=20)' src="http://www.knowsky.com/images/logo.gif" alt="www.knowsky.com" width="200" height="90" /></a>
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