can't get this form to work

I’ve never worked in php but I’ve had to take over a website that has php forms. Can someone look at this and tell me why it’s not working? Thanks!
[php]<?php include(‘db_connect.php’);

if($_POST['Submit']=='Submit'  && !empty($fname) && !empty($lname) && !empty($phone) && !empty($email) && !empty($proj_type)) {
	$sql = "INSERT INTO `design_proposal` (`design_proposal_id`,`fname`,`lname`,`phone`,`email`, `proj_type`,`concern`,`contact`) VALUES (NULL,'".mysql_real_escape_string($fname)."','".mysql_real_escape_string($lname)."','".mysql_real_escape_string($phone)."','".mysql_real_escape_string($email)."', '".mysql_real_escape_string($proj_type)."','".mysql_real_escape_string($concern)."','".mysql_real_escape_string($contact)."');";
	
	include('db_connect.php');
	
	$result = mysql_query($sql);
		if($result) {
					$msg3 .= "<p class=\"formmessagegreen\">Thank you! You have been successful at sending your design proposal.</p>";
				} else {
					$msg .= "<p class=\"formmessagered\">I'm sorry there was an error sending your design proposal.</p>";
				}
		if($_POST['contact']=='Yes') {	
			$concern = stripslashes($_POST['concern']);
			
			$to = '[email protected]';
			$header = 'MIME-Version: 1.0' . "\r\n";
			$header .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";//html based emails
			$header .="From: ".$email. "\r\n";
			$body = "<html><body>" .$fname." ".$lname."<br /> Email: ".$email. "<br /> Phone: ".$phone."<br /> Project Type: ".$proj_type. "<br /> Concern: " .$concern."<br /> Contact: " .$contact. "</body></html>";
			$subject = "Feedback for Free Design Proposal";
			
			$to1 = $email;
			$header1 = 'MIME-Version: 1.0' . "\r\n";
			$header1 .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";//html based emails
			$header1 .='From: [email protected]';
			$body1 = "<html><body>Thank you for contacting BuildTREND.  We will be in touch very soon to discuss your project and to answer your questions. <br>
					We are here to make your project and your home exceptional!<br>
					If you have any questions or would like to talk to us now, please call 1-800-959-7725 or email me at [email protected]<br><br>

					Best regards,<br>
					Shawn T. Gerety<br>
					President & CEO <br /> 
					www.buildtrend.com <br /> 
					<img src=\"http://www.buildtrend.com/images/BuildTREND-LOGO-DP.jpg\" alt=\"BuildTREND Logo\" width=\"395\" height=\"56\"/></body></html>";
			$subject1 = "Thank you ".$fname." ".$lname."!";
			
			//Sends mail to me, with elements created above
			
			$success = mail ($to, $subject, $body, $header) && mail ($to1, $subject1, $body1, $header1);

	} else {
			$concern = stripslashes($_POST['concern']);

			$to = '[email protected], [email protected]';
			$header = 'MIME-Version: 1.0' . "\r\n";
			$header .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";//html based emails
			$header .="From: ".$email. "\r\n";
			$body = "<html><body>" .$fname." ".$lname."<br / Email: >  ".$email. "<br /> Phone: " .$phone. "<br /> Concern: ".$concern."<br /> Contact: No</body></html>";
			$subject = "Free Design Propsal";
			
			
			$to1 = $email;
			$header1 = 'MIME-Version: 1.0' . "\r\n";
			$header1 .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";//html based emails
			$header1 .='From: [email protected]';
			$body1 = "<html><body>Thank you for visiting our website. We hope you found it helpful and informative! If there is one thing that we hope you took from your time with <br>
			<br><br>

			Best regards,<br>
			<br>
			President & CEO <br>
			<img src=\"http://www.buildtrend.com/images/BuildTREND-LOGO-DP.jpg\" alt=\"BuildTREND Logo\" width=\"395\" height=\"56\"/></body></html>";
			$subject1 = "Thank you ".$fname." ".$lname."!";

			$success = mail ($to, $subject, $body, $header) && mail ($to1, $subject1, $body1, $header1);

		}
} else {
	switch (true) { 

		case (!empty($email)): 
		$msg ="Please enter an email address.";
		$msg2= "class=\"asterisk\"";
		break;
		
		case (!empty($phone)): 
		$msg ="Please enter a phone number.";
		$msg2= "class=\"asterisk\"";
		break;
		
		case (!empty($fname)): 
		$msg ="Please enter your first name.";
		$msg2= "class=\"asterisk\"";
		break;
		
		case (!empty($lname)): 
		$msg ="Please enter your last name.";
		$msg2= "class=\"asterisk\"";
		break;
		
		case (!empty($proj_type)): 
		$msg ="Please Enter your project type.";
		$msg2= "class=\"asterisk\"";
		break;

		default:
		$msg = "formmessage";
		$msg2 = "class=\"asterisk1\""; 

}

}

?>[/php]

form

[code]

Get Your Free Design Proposal!

        <?php echo $msg3; echo $con . $mysql_error; ?>
        <p class="<?php echo $msg;?>">Please fill in all the required fields.</p>
        <form action="<?php $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data" name="Design Proposal" id="Design Proposal">
          <p>&nbsp;&nbsp;First Name <span <?php echo $msg2; ?>>*</span><br>

  

  Last Name >*
  

  Phone >*
  

  Email >*
  

  Tye of Project >*
   Bath Remodeling Basement Finishing Custom Cabinetry Kitchen Remodeling Other

  Biggest Remodeling Concern
  

  Please have someone call me about my project

 

 


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