IAT - counterbalancing order

Hi I am wondering whether it is possible to counterbalance the order of blocks in an IAT. I need for Blocks 1, 3, and 4 to swap with blocks 5, 6, 7 (i.e. participants either recieve block 1, 2, 3, 4, 5, 6, 7, or blocks 5, 2, 6, 7, 1, 3, 4, in this order). Between each block is an instruction page that needs to stay in place regardless of the order. I am actually conducting three IAT's and would like these randomly presented to participants. I haven't been able to figure out a way to present the three IAT's in random order - and within each IAT, have random alocation to one of the two block orderings.

Because there is so much going on in an IAT input file already, my first thought would be to generate a second input file with the alternate block order and consider it a between subjects factor. Would that work?

Yes that would work,

thanks

Suzie