Convert PHP mail function into CLASS.PHP.MAILER

Hello. I have a website, it has a request form using php mail function. My hosting provider supports SMTPAUTH only, so I need you to remake existing php file (using php function) into new one which will use class.php.mailer. I will provide you with php and html files so that you see all vars and correct all needed. I consider this job to be very simple for any experienced php programmer. It must be done during several hours. I am sure 2-3 hours will be enough. I offer $20 for this job. Thanks.