如何读取以下代码中的验证码

                <script language="javascript" type="text/javascript">
<div class="checkCode" id="Validater_Show" style="display: none">
                    <label for="txtCheckCode" class="loginLabel">
                        验证码：</label><input name="txtCheckCode" type="text" maxlength="6" id="txtCheckCode" style="width: 56px;" tabindex="3" onfocus="return  ShowCheckcode4input(this);" />
                    <a title="点击更换验证码" onclick="return ShowCheckcode();" href="#" style="cursor: pointer;">我看不清!</a>
                    <br />
                    <div class="code_img">
                        <div id="Validater1" onclick='return ShowCheckcode();'>
                        </div>
                        <div class="code_text">
                            验证码看不到？<a href="https://reg. target="_blank">点此查看帮助</a>
                        </div>
                    </div>
                </div>