java回车登陆

/**
         * 回车切换
         * @param event
         */
        function enterToTab(event){
          var e = event?event:window.event;
          if(e.keyCode == 13){
              submitword();
          }

        }

<p>
                    <label class="loginlabel" for="user_name"> 用户名:</label>
                    <input type="text" id="txtName" height="30px" class="logininput ui-keyboard-input ui-widget-content ui-corner-all" onkeydown="enterToTab(event);"  maxlength="12" width="260px">
                 </p>
                 <p>
                    <label class="loginlabel" for="user_password">密&nbsp;&nbsp;&nbsp;&nbsp;码:</label>
                    <span>
                        <input type="password" height="30px" maxlength="12" id="txtPassword" onkeydown="enterToTab(event);" class="logininput ui-keyboard-input ui-widget-content ui-corner-all" AutoComplete="off" width="260px">
                    </span>
               </p>