js验证密码输入

<script type="text/javascript">
  function fg(){
    var pass1 = document.getElementById("passWord2");
    var pass2 = document.getElementById("passWord1");
    if(pass2.value!=pass1.value){
      alert("密码不一致，请重新输入！");
    }else{
      form1.action="RegisterServlet";
      form1.submit();
    }
  }
  </script>
  </head>
  
  
  
  
   
    <form method="post" name="form1">
  
      <tr>
        <td width="150px">请输入用户名：</td>
        <td width="150px"><input type="text" name="regName" class="td_style"/></td>
      </tr>
      <tr>
        <td width="150px">请输入密码:</td>
        <td width="150px"><input  type="password" name="regPass" id="passWord1" class="td_style"/></td>
      </tr>
      <tr>
        <td width="150px">请确认密码:</td>