By Tim Wimborne CANBERRA (Reuters) - Emotions are always high when Iran and Iraq meet on the football pitch. On Friday, the rivals will clash in the quarter-finals of the Asian Cup in Canberra and the stakes could **t be higher but bragging rights are only part of the equation. The Iraq coach Radhi Shenaishil has warned his players to forget about who they're playing, telling them that cool heads are needed with the bigger carrot of a semi-final against South Korea in Sydney awaiting the winner. "Both Iran and Iraq will be telling their players to have a quality game and forget their emotions.