Did you mean deterrent, giga?
Anyways, Giga is totaly right about this one -- Israel has even been simultaneously attacked by the nations surrounding it and barely held its own. Their nuclear arsenal is just one for defense. If they wanted to maliciously put an end to their enemies surrounding them, they most certainly could, but thankfully, the US and Russia watches over that little region of the world very carefully and more then likely, if everyone around Israel dissapeared, so would Israel.
Not to mention of course the vast majority of the weapons that Israel has are weapons that we gave to them. Hardly worth taking a second look at.