Hi djaco99,
Yes, I've written several and I use eBookEditPro -
http://www.ebookedit.com. They are very eays to use and they turn off the "copy/paste" function so others can't steal your work.
You start by creating your book in your favorite HTML program and then save the pages as .html files. Then eBook Edit Pro turns those files into an ebook.
The book functions just like a web page within the software and when you send people to external websites, the site stays within the software and people just hit the "Back" arrow to go back to your book.
It automatically turns your book into an .exe file so all you have to do is upload it to your site.
I love it. I have an older version (2003) so I'm sure they've improved it even more since I bought mine.