The issue appears to be on line 77 of that file. Try updating that line to:
$MailBody = $MailBody . " <img src=\"http://www.fangearlive.com/orderfranciscanalliance/images/garments/".$fangearlive->DisplayInfo("Thumbnail") ."\"><br />".$fangearlive->DisplayInfo("Name") ."<br /> Size: " . $fangearlive->DisplayInfo("Size") ."\r\n";