6 dynamic mc's. split into 2 rows

im loading in 6 movieclips at a time from an xml file. I can paginate through them now thanks to help from the kirupians.

Im looking to split the 6 dynamic movie clips over 2 rows.

Could someone help me out. I know I have to modolus to move the ._y position of movieclips. But I cant seem to nail it.

Cheers in advance.