Syrian protesters hold a poster which shows pictures of Iranian President Mahmoud Ahmadinejad, Syrian President Bashar al-Assad and Lebanon's Hezbollah leader Sayyed Hassan Nasrallah during a protest calling for Syria's President al-Assad to step down, in front of the Syrian embassy in Amman May 1, 2011. REUTERS/Majed Jaber   (JORDAN - Tags: POLITICS CIVIL UNREST)