Prestige reset rank.

Does somebody have idea for to reset rank? and all xp stay?

Code:

---

startprestige()
{
        self.prestige++;
        self.rank = 0;
        self checkrank();
        self savestats();
}

checkrank()
{
        xp = self.xp;
        xp -= level.maxlevel_xp * self.prestige;
        //normal rank check stuff
}

---

It is REALLY REALLY EASY

Thanks :P