MY website is hacked

My website is hacked by someone that I don't know. This causing I lost some earning within this few days. So, sad. Just received mail from the web-hosting company saying that the web is restore, but when i go into my website I still can find the irritating hacker face there... you can check it out, http://www.yewkit.com/mybiz This guy already hacked so many website, If you know how to solve it please leave your comment here..