Now I am not the greatest statistician in the world - I understand how to show superiority with Fisher as applied to contingency tables but really am not sure what I'm doing with equivalence. Do I do two one-tailed Fishers? Or one two-tailed but somehow altered to have a null hypothesis in which there IS a difference? I'd be really grateful if someone could give me concrete steps as to how to calculate this - I've googled it like crazy and only confused myself further.

Thank you all in advance for your suggestions!

Tim