function mail_link( $sender ) { require_once dirname( dirname(__FILE__) ).'/class/post_check.php' ; $post_check = new Post_Check() ; $email = $this->get_sender_email( $sender ) ; switch( true ) { case ( empty( $email ) ) : return '' ; case ( ! $post_check->mailCheck( $email ) ) : return '' ; default : return '<input type="button" style="color: #808080;background: #FFFFFF;border: 1px solid #999999;" value="Email" onclick="location.href=\'mailto:'.$email.'\'">'; } }