Woodwork help. I want to build a doorframe for a downstairs WC.Where can i find plans or can anyone advise me?

To build a door frame is abit complicated. Best to buy a pre hung door from a building supply store. Here is a link on how to install a pre hung door. a href="http://www.ehow.com/how_15280_install-prehung-door.html" rel="nofollow"http://www.ehow.com/how_15280_install-pr…/a