At first:Sorry that last night i was a bit to lazy and overtired to write in proper english
I´ve already raed the manual but that wasn´t related to the kind of roofwindow i mentioned. HAve a look at http://www.velux.de and you will immidiately see what kind of window i mentioned, not upright windows but diagonal inside the roof placed windows is what i need and this tutorial was made for roofs with what we call in German "Gaubenfenster" and not "Schrägdachfenmster" due to the orientation the Window is placed inside the roof itself.
Perhaps i should have posted the link to show what kind o window i mentioned immidiately in the beginning of the thread [;)]