js控制div显示与隐藏

<!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=gb2312" />
<title>js显示隐藏层</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function showdiv(targetid,objN){
   
      var target=document.getElementById(targetid);
      var clicktext=document.getElementById(objN)


            if (target.style.display=="block"){
                target.style.display="none";
                clicktext.innerText="点击查看详细信息";
  


            } else {
                target.style.display="block";
                clicktext.innerText='关闭详细信息信息';
            }
   
}
-->
</script>
<style type="text/css">
<!--


body { font: normal 14px "宋体" }


a { text-decoration: none; }


#showtext { cursor: hand; cursor:pointer;}
#showtext2 { cursor: hand; cursor:pointer;}
#contentid { margin-top: 10px; width:100%; border: 1px solid #CCC; background: #F1F1F1; padding: 15px; }
#contentid2 { margin-top: 10px; width: 470px; border: 1px solid #CCC; background: #F1F1F1; padding: 15px; }
.none { display: none; }
-->
</style>
</head>


<body>
<a id="showtext" onClick="showdiv('contentid','showtext')">点击查看详细信息</a>
<div id="contentid" class="none">打开的内容</div>
<p></p>
<a id="showtext2" onClick="showdiv('contentid2','showtext2')">点击查看详细信息</a>
<div id="contentid2" class="none">1<br />
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</div>


</body>




</html>