I have two questions regarding a PHP form processor I'm using. The first question regards having a user select from a drop down menu what email address they would like the form data to go to. The second is how do I pass a file attachment from the form into the email that get's sent? Below is the Form Processor I'm using, which is pretty straight forward. Thanks in advance for any help you can give me.

Form Processor:

<?
///////////////////////////////////////////////////////////////////
// PERFECT //
// ------- //
// PHP E-mail Receive Form Electronic Content Text //
// File: feedback.php //
// Version: 1.7 (January 20, 2008) //
// Description: Processes a web form to read the user input and //
// then send the data to a predefined recipient. You are //
// free to use and modify this script as you like. //
// Instructions: Go to "http://www.centerkey.com/php". //
// //
// Center Key Software * www.centerkey.com * Dem T. Pilafian //
///////////////////////////////////////////////////////////////////

// Configuration Settings
$SendFrom = "Form Feedback <email@email.com>";
$SendTo = "email@email.com";
$SubjectLine = "New Full Application";
$ThanksURL = "thanks.html"; //confirmation page

// Build Message Body from Web Form Input
foreach ($_POST as $Field=>$Value)
$MsgBody .= "$Field: $Value\r\n";
$MsgBody .= "\r\n" . @gethostbyaddr($_SERVER["REMOTE_ADDR"]) . "\r\n" .
$_SERVER["HTTP_USER_AGENT"];
$MsgBody = htmlspecialchars($MsgBody, ENT_NOQUOTES); //make content safe

// Send E-Mail and Direct Browser to Confirmation Page
if(!mail($SendTo, $SubjectLine, $MsgBody, $file "From: $SendFrom\r\nReply-To: $SendFrom\r\n"))
die('<h1>Error: There was an error processing your form. Please try again later.</h1>');
header("Location: $ThanksURL");
?>

i think you will require imap function for sending and showing attachment
No idea about the exact process

The first question regards having a user select from a drop down menu what email address they would like the form data to go to

here is a simple html code to do the work for you

<form ...>
...
<select name="sendto">
<option value="sendto1@domain.com">sendto1@domain.com</option>
<option value="sendto2@domain.com">sendto2@domain.com</option>
...
<option value="sendton@domain.com">sendton@domain.com</option>
</select>
...
</form>

The second is how do I pass a file attachment from the form into the email that get's sent? Below is the Form Processor I'm using, which is pretty straight forward. Thanks in advance for any help you can give me.

you can use mail() function in php but you need to learn about SMTP protocol and how can you put up binary data within email message.

anyway I suggest you to use instead a ready made php script to do the work for you
I attached a code to do that with an example file "test_mail_attachment.php" for you to help you know how can you use the script.

ps. the script is not mine. I just have it as it has free copyrights and liked to share