kruskal wallis post hoc test in R

MM> Hello,
MM> I need nemenyi-test or any other post-hoc test for kruskal-wallis, but I
MM> just can't find out how to implement this in R.
MM> My data set is nitrite concentrations in four different groups which I
MM> intend to compare. The kruskal-wallis-test showed significance, but I
MM> still don't know between which groups these significances are.
MM> Can anybody help me with this?

library(coin)
example(oneway_test)

provides an example for a Nemenyi-Damico-Wolfe-Dunn test.

Stefan