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<html>
  <head>
    <title>Óû§µÇ¼</title>
    <meta http-equiv="content-type" content="text/html; charset=gb2312">
  </head>
 
  <script language="javascript">
       function check(){
              if (document.all.userName.value == ""){
                     alert("¶Ô²»Æ𣬵ǼÕʺŲ»ÄÜΪ¿Õ!");
                     return false;
              }
              if (document.all.userPWD.value == ""){
                     alert("¶Ô²»Æ𣬵ǼÃÜÂë²»ÄÜΪ¿Õ!");
                     return false;
              }
              return true;
       }
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  <body>
    <h2>Óû§µÇ¼</h2>
    <hr>
    <form name="form1" method="post" action="chkuser.jsp" onSubmit="return check()">
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           <input type="text" id="userName" name="userName"><br>
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