案例：HTML DOM案例     状态：可编辑再运行    进入横版
AخA
  <td onmouseover="showmenu('validation')" onmouseout="hidemenu('validation')">
 
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<html>
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<head>
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<style>
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body{font-family:arial;}
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table{font-size:80%;background:black}
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a{color:black;text-decoration:none;font:bold}
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a:hover{color:#606060}
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td.menu{background:lightblue}
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table.menu
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{
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font-size:100%;
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position:absolute;
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visibility:hidden;
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}
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</style>
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<script type="text/javascript">
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function showmenu(elmnt)
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{
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document.getElementById(elmnt).style.visibility="visible"
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}
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function hidemenu(elmnt)
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{
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document.getElementById(elmnt).style.visibility="hidden"
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}

 运行结果　
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