phpgmailer set from mail issue

I'm trying to use php mail class as shown in the example.

http://www.vulgarisoip.com/category/phpgmailer/

I'm using it my site's contact us form. Can I set the "$mail->From" address as the person who filled the form? When i reveive the mail it always shows that the "from address" as my gmail account. Any help would really helpful.

<?php
 require_once('phpgmailer/class.phpgmailer.php');
 $mail = new PHPGMailer();
 $mail->Username = 'username@gmail.com'; 
 $mail->Password = 'gmailpassword';
 $mail->From = 'from@hotmail.com'; // Like to set this address as the address of the person who filled the form
 $mail->FromName = 'User Name';
 $mail->Subject = 'Subject';
 $mail->AddAddress('myname@mydomain.com'); // To which address the mail to be delivered
 $mail->Body = 'Hey buddy, heres an email!';
 $mail->Send();
 
 
 ?>
 

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