Hardship withdraw from 401k tax exemptions?

On 11/2010. �I withdrew 15,000.00 from my 401k to put down on a primary residence(first time homebuyer). �My understanding is that IRS has certain tax rule exemption on Hardship withdrawl up to 10,000.00. �Does anybody know the rule to the exemption early withdrawl from a 401k? if so, what is the IRS form that I need to fill out, what is the CA-FTB form that I need to Fill out? what I'm finding out that rule only applies to early withdraw from IRA accounts.