All this talk is bulls%it.
If and when Saddam hits Israeli with WMD (barring there being 100,000's of casualties) ISRAEL WILL NOT HIT SADDAM BACK, EXCEPT SYMBOLICALLY.
Even if 500 Israelis die in the streets screaming with their skin melting off... the world media will play it down, deny Israel has a right to 'continue the cycle of violence', etc...
In this situation (the most likey), Israel will launch some conventional missiles and do a few bombing runs. Nothing will come as a result of this, it will be purely symbolic, and the world will declare that Israel has hit back. (anything beyond this will be 'disproportate').
Anyone who gets all fired up here thinking Saddam will do this and that, and Israel will nuke him or whatever... is being dellusional and doesn't understand what has happened to Israeli society since the early 1980s...
Israel in the late 70s would have nuked, Israel today has lost the ability (will) to EVER respond seriously, in ANY situation.
I honestly believe that in a general nuclear strike on Israel, Israelis would all die with all there nukes on the ground. And even then all Israel would do would be to maybe launch a couple nukes from their submarines, which the Islamic world would recover from quicky. Israel however, would be dead.
The biggest mistake Israel has made in the last two decades, and continues to make today, is to let its society head in the direction of 'Western logic' to Middle East (Arab/Islamic) confrontation.