I have this form done it complete and working fine when the form is submitted the information is emailed to an email id but all the content is shown in plain text when it de
You'll need to add the Content-type header, and add HTML tags to the email you're sending. So:
$headers = "From: $myemail\n";
$headers .= "Reply-To: $email\n";
$headers .= "Content-type: text/html";
Also, you'll need to convert \n to HTML line breaks, so:
$email_body = nl2br($email_body);
mail($to,$email_subject,$email_body,$headers);