<form action="${ctx}/user/login.dhtml" method="post">
    <div class="login_content">
          <input type="text" name="msg" id="msg" value='<s:property value="msg"/>'/>
          <div class="user_box"><input id="userName" name="userName" type="text"/></div>
          <div class="pw_box"><input  id="password"  name="password" type="password"/></div>
    </div>
     <div class="login_btn">
        <input id="loginBtn" type="submit" value=""/>
    </div>
    <div class="login_bot"></div>
    </form>