I don't think we intend to leave Israel out to dry and I'm sure Israel will be active in its own defense when we go into Iraq.
I have heard discussion that we may be able to jam Iraq's radar to the degree that they can't effectively launch missiles.
Nonetheless, Israel's small size and numerous enemies make one worry.
I would be interested to see what sort of hell Israel would unleash on Iraq if hit with potent nonconventional weapons.
The radar isn't required to launch SCUDs. It's a fire-and-forget weapon, controlled by internal systems. Our jammers do give their surface-to-air missiles fits, but not nearly as much as our HARM missiles fired in return do. :-)