OK, I'll just say a little bit more
There are basically 3 groups of people in the Iranian parliament:
1) Conservative hardliners
2) Conservative reformists
3) Reformists
The first group is exemplified by Ahmadinejad; they're real power-happy, religious, dickheads (I believe that's the correct scientific term).
The second group is exemplified by Ali Larijani, who was the nuclear envoy to the UN, until Ahmadinejad fired him. They basically want a dialogue with the US, but with minimal political change in Iran. Larijani could well become the president in next year's election.
The third group is exemplified by Ayatollah Mohammad Khatami. He wants real political change in Iran, and a dialogue with the West. He was the president from 1997 until Ahmadinejad was elected in 2005. He initiated the Dialogue of Civilisations, and was ready to talk to the US. The US was not interested. A very missed opportunity. Many of Khatami's attempted reforms were also blocked by the conservative hardliners. It was popular disillusion with Khatami (due to the inability of the reform movement to change anything) which led to people (particularly the younger generation) deciding not to vote in the 2005 election. Ahmadinejad got in on an anti-corruption ticket, and also more or less because it was mainly the conservative types who had voted.
Also: there is a cleric called Ayatollah Montazeri, who was originally billed as Khomeini's successor. But Montazeri doesn't believe that any mullah has the right to serve as God's representative on earth (which is what Khomeini claimed to be, and Khamenei claims to be today). He has been under house arrest in the holy city of Qom for at least the past decade. Quite incredible, as he is such a high-ranking cleric (technically senior to the Supreme Leader, who was only promoted to the rank of Ayatollah so tha he could take up the position).
What I'm trying to say is: the picture you get from the US & British governments is so grossly oversimplified that it is worrying.
Do Iranians want to live under their current regime? Frankly, I think that most of them do. But the minority who do not, really, really, hate their government. Do Iranians want to come in from the political cold? Yes, they do. They would love to have more Westerners visiting their country, and for Iran to be more open and friendly with the US. After all, Iran and US used to be best buddies.
Put it this way: any military attack on Iran would be not only misguided, but very sad indeed. It is a beautiful country, and its people are the most friendly and polite I have ever come across.