Contributing to a spousal IRA

I'm covered by a retirement plan at work, but my husband isn't. What's the maximum deductible contribution we can make for him to a traditional IRA for 2008?

If your joint adjusted gross income is $159,000 or less and you file a joint tax return, you can make a deductible contribution of up to $5,000. That limit rises to $6,000 if your husband is 50 or older. Once your joint AGI tops $159,000, however, the size of your deduction starts shrinking, and it disappears entirely when your joint AGI reaches $169,000.