I have the idea: to make hack which divide a topic into pages not by quantity of posts and by the topic size... It is useful for example when the user writes in one topic long messages, and in another short, at usual division the first variant will be too big, and another - too small and if to divide by the size they will be identical! I can't realize this idea myself, I have thought, what there can be here to me somebody will help?!

PS Sorry for my English