[R] manova and contrasts, again

[T.A.Wassenaar]

Hi R-people,

To determine contrasts after MANOVA I've found a piece of 
R-code provided by Yves Rosseel 
(http://tolstoy.newcastle.edu.au/R/help/04/06/0134.html), 
which has been very helpful. Now I Would like to determine 
contrasts for a model which has a main effect and an 
interaction effect, and in which both effects were found 
to be statistically significant. I'm a bit puzzled with 
the contrast matrix to feed the routine, especially for 
the interactions. Could anybody help me out here? If more 
information is necessary on the underlying model, pleas 
let me know.

Best regards,

Tsjerk