新手求解!Cannot modify header information…的有关问题TAT

新手求解!!Cannot modify header information…的问题TAT
我想用PHP contact form做一个inquiry page, 让人填上姓名、电话、email等, 按”send”就会将以上资料变成email 发到我的mail box

但其实我是新手…整个contact form基本上是用这个网教的抄抄改改出来的: http://myphpform.com/php-form-tutorial.php

按了”send”后我想网页跳到thank you page, 但会出现”Cannot modify header information – header already sent by (output started at C:\inetpub\wwwroot\contant2.php:1) in C:\inetpub \wwwroot\contant2.php on line 34” 这个问题

*Line34 = header('location:ThankYou.html');

我找过解决方法, 试了
1. 在header后加exit();
2. 加上和ob_end_flush();

最后是可以成功寄出email, 资料有遗漏也会跳到error page, 但都是无法去到thank you page…都是会出现Cannot modify header information(略)

请问我加exit / ob_start的地方有错吗? 还是有什么其他问题呢?
麻烦各位高手帮忙看看>
以下是代码

P.S.我是用notepad做这个php档的

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php ob_start(); ?><?phpdate_default_timezone_set ('Asia/Hong_Kong');ini_set("sendmail_from","[email&#160;protected]");ini_set("SMTP","smtp.wtt-mail.com");$myemail  = "[email&#160;protected]";$company = check_input($_POST['company'], "Please enter your company's name");$person = check_input($_POST['person'], "Please enter your name");$tel = check_input($_POST['tel'], "Please enter your contact number");$email = check_input($_POST['email'], "Please enter your E-mail");$subject  = "Online Enquiry";if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email)){    show_error("E-mail address not valid");}if (!preg_match("/^(https?:\/\/+[\w\-]+\.[\w\-]+)/i", $website)){    $website = '';}$message = "Hello!Contact form has been submitted by:Company Name: $companyContact Person: $personTel: $telE-mail: $emailContent:$contentEnd of message";mail($myemail,$subject,$message);header('location:ThankYou.html');exit();function check_input($data, $problem=''){    $data = trim($data);    $data = stripslashes($data);    $data = htmlspecialchars($data);    if ($problem && strlen($data) == 0)    {        show_error($problem);    }    return $data;}function show_error($myError){?>            <title>Order form error</title>    <style type="text/css">    .style2 {        text-align: center;        border-width: 0px;    }    </style>        <marquee direction="right" hspace="200" vspace="50" behavior="alternate">    <h2>
<b>Please correct the following error:</b><br><h2>    <h2>
<?php echo $myError; ?><h2></h2>
</h2>
</h2>
</h2></marquee>        <p>        </p><p class="MsoNormal" align="center">            <input type="button" value=" Back to previous page " onclick="history.back()">        </p><p class="MsoNormal" align="center">        </p>      <?phpexit ();}ob_end_flush();?>

------解决方案--------------------

探讨

喔...不好意思那空行是发帖时手滑按到的...

------解决方案--------------------
检查下文件是否有bom头，有的话去掉
在header('location: ThankYou.html');前面加上ob_clean();试试
------解决方案--------------------
除了 On 还需要设置显示的级别
error_reporting(E_ALL);

探讨

我把header那行改成
//header('location: ThankYou.html');
然後在php.ini改了display_errors = On
是這樣沒錯吧?

(我不是用apache是用IIS的)重启了之後......浏览器出現的是一片空白......