Is there a forumula for caluculating when a quest turns grey

[satanwantsme]

Is there a forumula for caluculating when a quest turns grey?

I assume it can be calculated using the players current level and the quest level, if anyone can share the forumla it would be much appreciated.

[BamED]

Character_Level <= Quest_Level + 5 : Quest_XP = Full_Quest_XP
Character_Level = Quest_Level + 6 : Quest_XP = ROUND(Full_Quest_XP * 0.8 / 5) * 5
Character_Level = Quest_Level + 7 : Quest_XP = ROUND(Full_Quest_XP * 0.6 / 5) * 5
Character_Level = Quest_Level + 8 : Quest_XP = ROUND(Full_Quest_XP * 0.4 / 5) * 5
Character_Level = Quest_Level + 9 : Quest_XP = ROUND(Full_Quest_XP * 0.2 / 5) * 5
Character_Level >= Quest_Level + 10 : Quest_XP = ROUND(Full_Quest_XP * 0.1 / 5) * 5

Some lower level quests (Quest_Level < 10) seem to give full XP only for Character_Level <= Quest_Level + 4, therefor decalating with 1 level the table above.