一段比较实用的JS导航条显隐例子 .

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script language="javascript">
  function fn(num){
    var i;
    for(i=1;i<=5;i++){
      var divtar=document.getElementById("div"+i);
      var buttontar=document.getElementById("button"+i);
      if(num==i){
        divtar.style.display="";
      }else{
        divtar.style.display="none";
      }
    }
  }
</script>
<title>无标题文档</title>
</head>

<body>
<p>&nbsp;</p>
<p>&nbsp;</p>
<div id="div1" >div1</div>
<div id="div2" style="display:none">div2</div>
<div id="div3" style="display:none">div3</div>
<div id="div4" style="display:none">div4</div>
<div id="div5" style="display:none">div5</div>
<p>
  <input type="submit" name="button" id="button1" value="button1" onclick="fn(1)" />
</p>
<p>
  <input type="submit" name="button2" id="button2" value="button2"  onclick="fn(2)"/>
</p>
<p>
  <input type="submit" name="button3" id="button3" value="button3" onclick="fn(3)"/>
</p>
<p>
  <input type="submit" name="button4" id="button4" value="button4" onclick="fn(4)"/>
</p>
<p>
  <input type="submit" name="button5" id="button5" value="button5" onclick="fn(5)" />
</p>
</body>
</html>

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