如何使文本字段'；s值为空，具体取决于使用jQuery的条件

我的网站使用PHP、MySQL、Smarty和HTML。现在的场景是，我有一组两个单选按钮（即Yes和No是它们的值）。我根据所选单选按钮的值显示和隐藏文本框。Hide/Show运行得很好。主要问题是，当我提交选中单选按钮且值为"否"的表单时，相关文本字段会被隐藏，但$_POST[]包含其中存在的文本字段值（如果有的话）。当用户选择值为"否"的单选按钮时，我想使这些文本字段的值为空。有人能在这方面帮我吗？提前谢谢。为了供您参考，我将Smarty模板中的代码片段以及隐藏/显示功能的代码放在这里。

首先，来自Smarty模板的代码如下：

<table>
    <tr height="30">
        <td align="right" width="300"><label><b>{'Do you want to use call to
                    action
                    ?'|signal_on_error:$error_msg:'newsletter_call_to_action_status'}</b>
                <strong style="color: red">*</strong></label></td>
        <td>&nbsp; <input type="radio"
            name="newsletter_call_to_action_status"
            id="newsletter_call_to_action_status" value="1"
            onclick="select_option(this.value);"
            {if $data.newsletter_call_to_action_status=='1' } checked {/if}> Yes
            <input type="radio" name="newsletter_call_to_action_status"
            id="newsletter_call_to_action_status" value="0"
            onclick="select_option(this.value);"
            {if $data.newsletter_call_to_action_status=='0' } checked {/if}> No
        </td>
    </tr>
    <tr id="action_link_no" {if $data.newsletter_call_to_action_status==
        '1' }style="display:;" {else}style="display:none;"{/if}>
        <td colspan="2">&nbsp;</td>
    </tr>
    <tr class="action_link_yes" height="30"
        {if $data.newsletter_call_to_action_status== '1' }style="display:;"
        {else}style="display:none;"{/if}>
        <td align="right" width="300"><label><b>{'Enter call to action
                    text'|signal_on_error:$error_msg:'newsletter_call_to_action_text'}</b>
                <strong style="color: red">*</strong></label></td>
        <td>&nbsp;<input type="text" name="newsletter_call_to_action_text"
            id="newsletter_call_to_action_text"
            value="{if $data.newsletter_call_to_action_status == '0'}{else}{$data.newsletter_call_to_action_text}{/if}"
            maxlength="50" class="inputfield">
        </td>
    </tr>
    <tr>
        <td colspan="2">&nbsp;</td>
    </tr>
    <tr class="action_link_yes" height="30"
        {if $data.newsletter_call_to_action_status== '1' }style="display:;"
        {else}style="display:none;"{/if}>
        <td align="right" width="300"><label><b>{'Enter call to action
                    link'|signal_on_error:$error_msg:'newsletter_call_to_action_link'}</b>
                <strong style="color: red">*</strong></label></td>
        <td>&nbsp;<input type="text" name="newsletter_call_to_action_link"
            id="newsletter_call_to_action_link"
            value="{if $data.newsletter_call_to_action_status == '0'}{else}{$data.newsletter_call_to_action_link}{/if}"
            class="inputfield">
        </td>
    </tr>
</table>

现在执行隐藏/显示功能的jQuery代码如下：

{literal}
<script language="javascript" type="text/javascript">
  function select_option(plan){ 
    if(plan == '0'){
        $('#action_link_no').fadeOut('fast');
        $('.action_link_yes').fadeOut('fast');
    }else{
        $('#action_link_no').fadeIn('fast');
        $('.action_link_yes').fadeIn('fast');
    }
}
</script>
{/literal}