HTML - How To Add Extra Emails To A Mail Form?

<form name="htmlform" method="post" action="html_form_send.php">
<table width="500px">
</tr>
<tr>
 <td valign="top">
  <label for="name">Name*</label>
 </td>
 <td valign="top">
  <input  type="text" name="name" maxlength="50" size="30">
 </td>
</tr>
 
<tr>
<td valign="top">
  <label for="email">Email Address*</label>
 </td>
 <td valign="top">
  <input  type="text" name="email" maxlength="80" size="30">
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="telephone">Location (city, state, country)*</label>
 </td>
 <td valign="top">
  <input  type="text" name="location" maxlength="50" size="30">
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="telephone">Website Address*</label>
 </td>
 <td valign="top">
  <input  type="text" name="website" maxlength="50" size="30">
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="telephone">Website Title*</label>
 </td>
 <td valign="top">
  <input  type="text" name="websitetitle" maxlength="50" size="30">
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="telephone">Listing Category*</label>
 </td>
 <td valign="top">
<select name="category">
<option>Select Category
<option>BOAT SHOWS/EVENTS
<option>BOATING ASSOCIATIONS
<option>BOOKS/MAGAZINES
<option>BROKERS - NEW BOATS
<option>BROKERS - USED BOATS
<option>CHARTERS
<option>CLASSIFIEDS
<option>FINANCE/INSURANCE
<option>FORUMS
<option>MARINAS
<option>PARTS/ACCESSORIES
<option>REPAIR/MAINTENANCE
<option>SERVICES
</select>
 </td>
</tr>

<tr>
 <td valign="top">
  <label for="comments">Website Description (25 words or less)*</label>
 </td>
 <td valign="top">
  <textarea  name="comments" maxlength="300" cols="25" rows="6"></textarea>
 </td>
 
</tr>
<tr>
 <td colspan="2" style="text-align:center">
  <input type="submit" value="Submit">   
 </td>
</tr>
</table>
</form>

<?php
if(isset($_POST['email'])) {
     
    // CHANGE THE TWO LINES BELOW
    $email_to = "submit@boatinghitlist.com";
     
    $email_subject = "Boating Hit List Submission";
     
     
    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors before submitting.<br /><br />";
        die();
    }
     
    // validation expected data exists
    if(!isset($_POST['name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');      
    }
     
    $name = $_POST['name']; // required
    $email_from = $_POST['email']; // required
    $location = $_POST['location']; // required
    $website = $_POST['website']; // required
    $websitetitle = $_POST['websitetitle']; // required
    $category = $_POST['category']; // required
    $comments = $_POST['comments']; // required
     
    $error_message = "";
    $email_exp = "^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$";
  if(!eregi($email_exp,$email_from)) {
    $error_message .= 'Please enter a valid e-mail address.<br />';
  }
    $string_exp = "^[a-z .'-]+$";
  if(!eregi($string_exp,$name)) {
    $error_message .= 'Please enter a valid name.<br />';
  }
  if(strlen($comments) < 2) {
    $error_message .= 'Please enter a valid website description.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Form details below.\n\n";
     
    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }
     
    $email_message .= "Name: ".clean_string($name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Location: ".clean_string($location)."\n";
    $email_message .= "Website Address: ".clean_string($website)."\n";
    $email_message .= "Website Title: ".clean_string($websitetitle)."\n";
    $email_message .= "Listing Category: ".clean_string($category)."\n";
    $email_message .= "Website Description: ".clean_string($comments)."\n";
     
     
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers); 
?>
 
<!-- place your own success html below -->
<p><center><img src="http://www.boatinghitlist.com/BHLlogo.gif">
<p><font face="calibri" size="4"> 
Thank you for submitting your website to BoatingHitList.com.</font>
<p><font face="calibri" size="4"> 
Please make sure you include a link back to us on your website.  All websites are individually reviewed to ensure they are placed in the correct category and that your website links back to us.  Upon your website's approval, you will receive an e-mail notification.  If your website is denied, you will receive an e-mail with the reason(s) your website was denied.
<p>Choose one of the codes below to display our link back on your website:
<p>
<textarea rows="6" cols="30">
<a href="http://www.boatinghitlist.com" target="_blank"><img src="http://www.boatinghitlist.com/BHLicon.jpg" height="70" width="70" border="0"></a>
</textarea>
<p>
Will display as:
<p>
<a href="http://www.boatinghitlist.com" target="_blank"><img src="http://www.boatinghitlist.com/BHLicon.jpg" height="70" width="70" border="0"></a>
<p>
<textarea rows="6" cols="30">
Visit <a href="http://www.boatinghitlist.com" target="_blank">www.BoatingHitList.com</a> for a directory of boating industry websites!
</textarea>
<p>
Will display as:
<p>
Visit <a href="http://www.boatinghitlist.com" target="_blank">www.BoatingHitList.com</a> for a directory of boating industry websites!
<p>
<a href="http://www.boatinghitlist.com">CLICK HERE TO GO BACK TO www.BoatingHitList.com</a>
 
<?php
}
?>

<form action="http://lucaswynne.com/v-cgi/forms.cgi"
      enctype="application/x-www-form-urlencoded"
      method="post">
<table>  <tr>
    <th align="right">
      Name:
    </th>
    <td>
      <input type="text" name="Name"  size="30" />
    </td>
  </tr>
  <tr>
    <th align="right">
      EMail:
    </th>
    <td>
      <input type="text" name="EMail"  size="30" />
    </td>
  </tr>
  <tr>
    <th align="right">
      Subject:
    </th>
    <td>
      <select name="Subject" size="1">
        <option value="Ask Lucas">Ask Lucas</option>
        <option value="Management  and Booking">Management  and Booking</option>
        <option value="Website Administrator">Website Administrator</option>
        <option value="Lucas Fan Mail">Lucas Fan Mail</option>
      </select>
    </td>
  </tr>
  <tr>
    <th align="right">
      City, State/Province:
    </th>
    <td>
      <input type="text" name="City__State_Province"  size="30" />
    </td>
  </tr>
  <tr valign="top">
    <th align="right">
      Message:
    </th>
    <td>
      <textarea name="Message" rows="6" cols="30"></textarea>
    </td>
  </tr>
  <tr>
    <th></th>
    <td>
     <input type="submit" name="Submit_Form" value="Submit" />
    </td>
  </tr>
</table><input type="hidden" name="_vDeckformid" value="146" />
</form>

<form method=post action="/cgi-bin/example.cgi">
<input type="text" size="12" maxlength="30" />
<input type="Submit" value="Submit" action="mailto:jjrsportsfan@yahoo.com" />
</form>

<form name="form1" method="post"  action="http://wrathchild.edit-strike.nl/securemail.php">                    
<input type=hidden name="subject" value="Request from site">
<input type=hidden name="required" value="fullname,email">
<input type=hidden name="redirect" value="http://wrathchild.edit-strike.nl/thankyou.html">
Name:<br><input type=text name="fullname"> 
<P>                     
E-mail:<br><input type=text name="email">
<P>
What kind of graphic would you like ?<br>
<select>
<OPTION VALUE="signature">Signature
<OPTION VALUE="spray">CS:S Spray/Logo
<OPTION VALUE="Web Banner">Web Banner
<OPTION VALUE="other">Other
</select>
<p>
Details:<br><textarea name="details" rows="10" cols="50"> </textarea>
 <P>
 <P>
 <P>                     
<input type="submit" name="Submit" value="Submit"><br>                   
</form>