208827 Create a mortgage calculator

I would like someone to make an extra repayment mortgage calculator for me. There are several going around the internet, a quick google search in [login to view URL] should list a few. You can find one here [login to view URL] however i like the look and feel of the one i've attached as a picture. I think they are written in flash but i'm not sure. I have all the calculations in a spreadsheet. I want to integrate it into my new Joomla site i'm building and don't want anyone to be able to copy it from there.