A ground invasion of Iran is out of the question, but air strikes are pretty much certain. Ineterstingly, the Iranian army has distanced itself from the Head of the Revolutionary Guards statement that if the US attacks Iran, the first nation they will strike is Israel.
http://www.breitbart.com/news/2006/05/03/D8HCGF081.html
Brig. Gen. Alireza Afshar probably realises that if Iran attacks Israel, he will probably have a military force that is 5-10% of its present size in about 24 hours...