Joining fixed text to a SUBJECT variable

-- G'day ,

I have a basically simple problem the solution to which has eluded me
for several days.

I have a form being handled by a .php file.

I want the received email sent by the form to have as its SUBJECT the
combination of the form name "RVRA Contact Form - " and the MESSAGE
SUBJECT as chosen in the form drop down box.

Here is the current contact2.php file - but the SUBJECT only shows as
RVRA Contact Form -

<?php

// get posted data into local variables
$EmailAddress = Trim(stripslashes($_POST['EmailAddress']));
$EmailTo = "[email protected]";
$Subject = "RVRA Contact Form - ,$MessageSubject";
$Name = Trim(stripslashes($_POST['Name']));
$EmailAddress = Trim(stripslashes($_POST['EmailAddress']));
$YesNo = Trim(stripslashes($_POST['YesNo']));

$MessageSubject = Trim(stripslashes($_POST['MessageSubject']));
$Message = Trim(stripslashes($_POST['Message']));

// send email
if(!isset($_REQUEST['identiPIC_selected'])){exit;}

$identiPIC[1] = "Bird";
$identiPIC[2] = "Logo";
$identiPIC[3] = "Flower";

if($_REQUEST['identiPIC_selected'] !== $identiPIC){print "<meta
http-equiv=\"refresh\" content=\"0;URL=error-pic.html\">"; exit;}




// prepare email body text
$Body = "";

$Body .= "Name: ";
$Body .= $Name;
$Body .= "\n";

$Body .= "EmailAddress: ";
$Body .= $EmailAddress;
$Body .= "\n";

$Body .= "RVRA Member";
$Body .= $YesNo;
$Body .= "\n";



$Body .= "Message Subject: ";
$Body .= $MessageSubject;
$Body .= "\n";

$Body .= "Message: ";
$Body .= $Message;
$Body .= "\n";


// send email
$success = mail($EmailTo, $Subject, $Body, "From: <$EmailAddress>");

// redirect to success page
if ($success){
     print "<meta http-equiv=\"refresh\" content=\"0;URL=thanks.html\">";
}
else{
     print "<meta http-equiv=\"refresh\" content=\"0;URL=error-pic.html\">";
}

?>

The critical line is line 4:

$Subject = "RVRA Contact Form - ,$MessageSubject";

Can anyone please advise or point me in the right direction for
instructions on how to combine the fixed text with the variable
$MessageSubject.

Thanks....

Mike

Michael CALDER
73/81 Willandra Road,
CROMER NSW 2099
02 9981 6327