Here’s a lovely picture from the website of the Ibrahim Mousawi’s Al Intiqad: the Hezbollah newspaper.
My Arabic is just terrible, so I don’t know what these guys are saying.
However, as Mousawi has been invited to tour the United Kingdom by the Stop the War Coalition, my guess is that it is some kind of anti-war slogan. Perhaps it says:
“NO TO WAR – YES TO CO-EXISTENCE – GIVE PEACE A CHANCE”
Before DaveM gets here and disillusions me, feel free to post your own guesses.