Problem with proper function of a button.

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HTML

PHP

web_development

Hello everyone. My task is to create a 'Contact Us' form where the users can type a message, click a button, and it will send it to my e-mail.

What I have:
four files:

error_message.html -- 'Oops, something went wrong' form.
feedback_form.html -- This contains my actual form.
send_mail.php -- This is the action which would send the email.
thank_you.html -- Confirmation of the send.

Here is the feedback_form.html

<div class="main_body">
                <p>Send Us Your Feedback!</p>
                <form action="send_mail.php" method="post">
                <table>
                <tr>
                <td>Email Adress:</td>
                <td>
                <input type="text" name="email_address" value="" maxlength="100" />
                </td>
                </tr>
                <tr>
                <td>Comments:</td>
                <td>
                <textarea rows="10" cols="50" name="comments"></textarea>
                </td>
                </tr>
                <tr><td>&nbsp;</td>
                <td>
                <input type="submit" value="Submit" />
                </td>
                </tr>
                </table>
                </form>
            </div>

Now, What I wanted to happen, was to run the send_mail.php:

<?php
/*
This first bit sets the email address that you want the form to be submitted to.
You will need to change this value to a valid email address that you can access.
*/
$webmaster_email = "Myemail@mail.com";

/*
This bit sets the URLs of the supporting pages.
If you change the names of any of the pages, you will need to change the values here.
*/
$feedback_page = "feedback_form.html";
$error_page = "error_message.html";
$thankyou_page = "thank_you.html";

/*
This next bit loads the form field data into variables.
If you add a form field, you will need to add it here.
*/
$email_address = $_REQUEST['email_address'] ;
$comments = $_REQUEST['comments'] ;

/*
The following function checks for email injection.
Specifically, it checks for carriage returns - typically used by spammers to inject a CC list.
*/
function isInjected($str) {
	$injections = array('(\n+)',
	'(\r+)',
	'(\t+)',
	'(%0A+)',
	'(%0D+)',
	'(%08+)',
	'(%09+)'
	);
	$inject = join('|', $injections);
	$inject = "/$inject/i";
	if(preg_match($inject,$str)) {
		return true;
	}
	else {
		return false;
	}
}

// If the user tries to access this script directly, redirect them to the feedback form,
if (!isset($_REQUEST['email_address'])) {
header( "Location: $feedback_page" );
}

// If the form fields are empty, redirect to the error page.
elseif (empty($email_address) || empty($comments)) {
header( "Location: $error_page" );
}

// If email injection is detected, redirect to the error page.
elseif ( isInjected($email_address) ) {
header( "Location: $error_page" );
}

// If we passed all previous tests, send the email then redirect to the thank you page.
else {
mail( "$webmaster_email", "Feedback Form Results",
  $comments, "From: $email_address" );
header( "Location: $thankyou_page" );
}
?>

But, instead, what happens is that when I click submit on the first form, I end up downloading the send_mail.php file.

What is my problem? And what is the proper approach? Thanks to all.


NOTE: I had downloaded this as a template from a website:
http://www.quackit.com/php/tutorial/php_mail_configuration.cfm[^]