PHP Contact form not working

This basic contact form on my web page is not working. This seems pretty basic, but for some reason it’s not sending the form. Any Help/Suggestions would be greatly appreciated - TIA.

Regards,
Brian

Here is the form code:

[color=Blue]<form method=“post” action=“contactme.php” >
<p align=“center”>
<b><font size=“2” face=“Verdana”>Name: <input type=“text” name=“name” size=“30”/>
<br>
<br>
Phone: <input type=“text” name=“phone” size=“30”>
<br>
<br>
Email: <input type=“text” name=“email” size=“30”>
<br>
<br>
Message: <textarea name=“message” cols=“30” rows=“5”> </textarea>
<br>
<br>
<input type=“submit” value=“Send Form”> </font></p>
</form>[/color]

and the PHP form code:

[color=Blue] <?PHP
if(isset($_POST[‘submit’])) {
$to = "brian@thedentistschoice.com";

$re = “Feedbackfromcontactpage”;

$name_field = $_POST[‘name’];
$phone_field = $_POST[‘phone’];
$email_field = $_POST[‘email’];
$message = $_POST[‘message’];

$body = "From: $name_field
E-Mail: $email_field
Message: $message
Phone: $phone_field
";
echo “Data has been submitted to $to!”;

mail($to,$re,$body);
} else {

echo “Thank you for submitting your contact information. We will contact you as soon as possible.”;

}
?>[/color]