You know the scenario. It happens every time.
A pass is made. The flag goes up. The whistle blows. Supporters of the offending team will collectively proclaim "Ah ref ... there's NO WAY that was offside". If the flag doesn't go up, the defending team will be supported by claims of a missed offside or a blind referee (or both).
Let's start with some education:
http://www.fifa.com/mm/document/afdeveloping/refereeing/law_11_offside_en_47383.pdf
First, your players.
