Yahoo! News - Hamas to Consider Halting Attacks if Israel Leaves

Basically what I would say to the occupation army is to leave ... the Palestinian cities in all the West Bank that were occupied ... And stop your aggression, demolishing homes. Release prisoners and stop assassinations. Once the occupation and all those measures against our people stop, we are ready to totally study stopping martyrdom operations, in a positive way.

Even if Israel meets these conditions (which would be a mistake), Yassin is only willing to "totally study" stopping suicide attacks.