Iran's leaders are urging people to vote in Friday's parliamentary elections, saying it is a religious duty. <br /> <br />It is a contest between supporters of the President Mahmoud Ahmadinejad , and the Supreme Leader Ayatollah Ali Khamenei.<br /> <br />Opposition leaders are not taking part, because many are being held under house arrest.<br /> <br />Al Jazeera's Zeina Khodr reports from Tehran
