Randomizing and Instruction screens

[Gary London]

Hello,
I need to randomize between blocks and within blocks. The only problem is that I don't know how to assign the instruction screen a number so that it stays with each block and doesn't become randomized within the block itself. I tried using 0 for wgr and 1 for bgr, but that only keeps the instruction screen in a certain position that does not correspond to the proceeding trials. Visually, it looks like this:
bgr wgr
instructions 1 0
trial1 1 1
trial2 1 1
instructions 1 0
trial3 1 2
trial4 1 2
.
.
etc.

thanks for any input.