新手求问，关于js登录验证有关问题

新手求问，关于js登录验证问题

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><script type="text/javascript">    function logincheck(){        if (loginform.user.value=""){            alert ("请输入用户名");            loginform.user.focus();            return false;            }        if (loginform.pw.value=""){            alert ("请输入用户名");            loginform.pw.focus();            return false;            }    }</script>    <div id="login">             <div id="top">           <div id="top_left"><img  src="images/login_03.gif" alt="新手求问，关于js登录验证有关问题" ></div>              <div id="top_center"></div>         </div>         <form action="login.php" method="post" name="loginform" onsubmit="return logincheck(this);">             <div id="center">                  <div id="center_left"></div>                  <div id="center_middle">                       <div id="user">用 户                         <input type="text" name="user">                       </div>                       <div id="password">密   码                         <input type="password" name="pw">                       </div>                       <div id="btn">                        <input type="submit" value="登录" name="submit">                        <input type="reset" value="取消" name="reset">                       </div>                                    </div>                  <div id="center_right"></div>                      </div>         </form>         <div id="down">              <div id="down_left">                  <div id="inf">                       <span class="inf_text">版本信息</span>                       <span class="copyright">留言管理系统 2012 v1.0</span>                  </div>              </div>              <div id="down_center"></div>                  </div>    </div>

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