I created an email script using the mail() function. Thanks to the help of the many talented individuals here I have got it working and secured it.

But when anyone enters a coment such as:
I'm still hungry!

it comes out in the email as:
I\'m still hungry!

How do I make sure it keeps the text format.

Here is my code
      //Checks single-line inputs:
      //Returns false if text contains newline characters
      function has_no_newlines($text) 
      	return preg_match("/(%0A|%0D|\n+|\r+)/i", $text);
      //Checks multi-line inputs:
      //Returns false if text contains newline followed by email-header specific strings
      function has_no_emailheaders($text)
     		return preg_match("/(%0A|%0D|\n+|\r+)(content-type:|to:|cc:|bcc:)/i", $text);

 		// Effectively turns off dangerous register_globals without having to edit php.ini
		if (ini_get(register_globals))  // If register_globals is enabled
			// Unset $_GET keys
  			foreach ($_GET as $get_key => $get_value) {
    		if (ereg('^([a-zA-Z]|_){1}([a-zA-Z0-9]|_)*$', $get_key)) eval("unset(\${$get_key});");
  			// Unset $_POST keys
  			foreach ($_POST as $post_key => $post_value) {
    		if (ereg('^([a-zA-Z]|_){1}([a-zA-Z0-9]|_)*$', $post_key)) eval("unset(\${$post_key});");
 			 // Unset $_REQUEST keys
  			foreach ($_REQUEST as $request_key => $request_value) {
    		if (ereg('^([a-zA-Z]|_){1}([a-zA-Z0-9]|_)*$', $request_key)) eval("unset(\${$request_key});");
	   // All form fields are automatically passed to the PHP script through the variable $_post Introduced in PHP version 4.1.0
	   // for earlier versions, use the array $HTTP_POST_VARS
		$name = $_POST['name'];
		$mail = $_POST['mail'];
		$telephone = $_POST['telephone'];
		$city = $_POST['city'];
		$state = $_POST['state'];
		$country = $_POST['country'];
		$comments = $_POST['comments'];
		$to = "someone@this.com";
		$subject = "Technical Support";
		$headers = "From: " . $name;
		$message = "From: " . $name . "\r\n". $mail . "\r\n" . $telephone . "\r\n" . $city . "\r\n" . $state . "\r\n" . $country . "\r\n" . "\r\n" . $comments;		
		// PHP form validation: checks that the Email field contains a valid email address and the Name, Country, and Comments fields aren't empty
		// preg_match performs a regular expression match. It's a very powerful PHP function to validate form fields and other strings - see PHP manual for details
		if ($name == "") {
  			echo "<h4>You did not provide your name.</h4>";
  			echo "<a href='javascript:history.back(1);'>Back</a>";
			} elseif (!preg_match("/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/", $mail)) {
  			echo "<h4>Invalid email address</h4>";
  			echo "<a href='javascript:history.back(1);'>Back</a>";
			} elseif ($telephone == "") {
  			echo "<h4>You did not provide a phone number</h4>";
  			echo "<a href='javascript:history.back(1);'>Back</a>";
			} elseif ($country == "") {
  			echo "<h4>It is helpfull for us to know which contry you are in.</h4>";
  			echo "<a href='javascript:history.back(1);'>Back</a>";
			} elseif ($comments == "") {
  			echo "<h4>Please provide a brief descrition about how we can help you.</h4>";
  			echo "<a href='javascript:history.back(1);'>Back</a>";
			else {
			echo "<h4>true</h4>";
		// Sends the mail and outputs the "Thank you" string if the mail is successfully sent or the error string if it fails	
			elseif (mail($to,$subject,$message,$headers)) {
			echo "<h4>Thank you for your request for technical support information from Sandhill Scientific.<br />  Your message will be answered expeditiously.</h4>";
			} else {
  			echo "<h4>We seem to be expiriencing technical dificulties.<br /> 
  			Plese feel free to contact us through email at:<br /> technicalsupport@sandhillsci.com<br />
  			by Fax: 303-470-2975 or by telephone: 303-470-7020<br />
  			Monday thorught Friday 6am-5pm MST<br />
  			(available after hours by calling in to the above phone number and following the message.)</h4>";
		// error reporting enabled
	   // error_reporting(E_ALL ^ E_NOTICE);