i know not of rugby league but a simple "internet search" uncovered this...

Rugby league

A defending player is offside if he is less than 10m away from the play-the-ball (or, if the play-the-ball is inside his 10m line, closer to it than the try-line is) when the ball is played. He is also offside if, during open play, he is closer to the opposition's try-line than the ball. At a scrum a defending player is also offside if he is less than 5m away from the base of the scrum.
An attacking player is offside if he is in front of the ball: if he is in front of a ball which is then kicked, he can be put onside if the kicker subsequently moves ahead of him before the ball is caught. If not, he must stand 10m away from the player who catches the ball (as if he were the acting half-back at a play-the-ball) or be penalised.

Posted By: Tombs, Nov 9, 14:17:31