Added. Although I like theymos' original post better, you do link there and yours is probably more Newbie-friendly.
Exactly, the one from theymos is also easier but people have to look quite deeply if they don't have any idea about if/else. That's why I have thought to explain it in easier language.
This reminded me an explanation of the DT-system is also needed.
Well, I will do one within tomorrow. I have to find out whether there is an easier explanation.
Edit-[Explained] How DT system works