Israel will not attack Iran on its own because it cannot hope to survive the massive retaliation that would come from such an action. Israel does not have a good enough defence. It would be suicidal for Israel to even consider a strike on Iran. Iran would be within its right to pre empt a strike on Israel given the constant unceasing threats Israel has made to attack it.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: The day after Iran's tomorrow