To send HTML emails, you will need special email headers:
$headers = "MIME-Version: 1.0\r\n"; $headers .= "Content-type: text/html; charset=iso-8859-1\r\n"; $headers .= "From: FROM-EMAIL@YOURDOMAIN.COM\r\n" ."Reply-To: REPLY-EMAIL@YOURDOMAIN.COM"; mail('TO EMAIL ADDRESS', 'SUBJECT LINE', 'Message Body<br /><small>With some HTML</small>', $headers);

I'm a programmer at 