You don't necessarily have to attack the reactor. The reactor will provide the material which will be used to build the bombs. This will most likely be done at another facility.
According to the NYtimes, US administration officials have assured Israel that Iran is still at least 12 months away from being able to produce a weapon:
Quote:
WASHINGTON — The Obama administration, citing evidence of continued troubles inside Iran's nuclear program, has persuaded Israel that it would take roughly a year — and perhaps longer — for Iran to complete what one senior official called a “dash” for a nuclear weapon, according to American officials.
Administration officials said they believe the assessment has dimmed the prospect that Israel would pre-emptively strike against the country’s nuclear facilities within the next year, as Israeli officials have suggested in thinly veiled threats.
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http://www.nytimes.com/2010/08/20/wo...policy.html?hp