How to watch dvd movie on PSP

Anyway to convert the dvd files to normal video format? cos i wanna put them on my psp..

It has an option to convert, I suppose anything except .rm files, into PSP video format

go to this website:

http://www.download.com/Gogo-DVD-To-PSP-Converter/3000-2140_4-10571174.html?tag=lst-0-3