Dude, it comes with vB3 there is no particular hacks, ALL vB3 has this feature.
If you want this for vB2.3.2, I am very sure that there is a hack here that does the same thing for vB2.3.2 as well.
loading down vB 2.x with more and more hacks to make it like vb3 is utterly useless as your forum becomes more of a blolb of bad coding, if you want all these vb3 features so badly switch to vb3 ;D