PHP geneerate email blank in Yahoo

The email appears correctly in Outlook. Here is my code

$headers = "From: [email protected]
";
$headers .= "Reply-To: [email protected]
";
$headers .= "MIME-Version: 1.0
";

//$headers .= "Content-Type: text/html; charset=ISO-8859-1
“;
$headers .= “Content-Type: multipart/related; type=“multipart/alternative”;boundary=”----=MIME_BOUNDRY_main_message”
";
$headers .= "X-Sender: [email protected]
";
$headers .= "X-Mailer: PHP4
"; //mailer
$headers .= "X-Priority: 3
"; //1 UrgentMessage, 3 Normal
$headers .= "Return-Path: [email protected]; [email protected]
";
$headers .= "This is a multi-part message in MIME format.
";
$headers .= "------=MIME_BOUNDRY_main_message
“;
$headers .= “Content-Type: multipart/alternative; boundary=”----=MIME_BOUNDRY_message_parts”
";

//plaintext section begins
$message = "------=MIME_BOUNDRY_message_parts
";
$message .= "Content-Type: text/plain; charset=“iso-8859-1”
";
$message .= "Content-Transfer-Encoding: quoted-printable
";
$message .= "
";
$message .= stripslashes($title) . "
";
$message .= “Please visit MYDOMAIN.COM”;
$message .= "
";
//html section begins
$message .= "------=MIME_BOUNDRY_message_parts
";
$message .= "Content-Type: text/html;
charset=“iso-8859-1”
";
$message .= "Content-Transfer-Encoding: base64

";
$message .= chunk_split(base64_encode($emailbody));

$message .= "
";
$message .= "------=MIME_BOUNDRY_message_parts–
";
$message .= "
";
$message .= "------=MIME_BOUNDRY_main_message–
";

My email body is one string html code cut from dreamweaver of everything between

 and 

with all quotations escaped as "

I forget where I actually hacked up this code from, but I had to comment out

//$headers .= "Content-Type: text/html; charset=ISO-8859-1
";

or the email that comes in is a bunch of gibberish in Yahoo (but not blank), but still comes up properly in Outlook.

Please help.

Ron R.