If you can prove to INS that you didnt break "continuous residence", the time you were out Jun 2005 - Jan 2006 (7 months, unfortunately > 6months), then you can apply.
The documents you need to prove that you havent broken "continuous residence", are as follows -> quoted from "Guide to Naturalization"
"If you have taken any trip outside of the United States that lasted for 6 months or more since becoming a Permanent Resident, send evidence that you (and your family) continued to live, work, and/or keep ties to the United States, such as:
*An IRS tax return “transcript” or an IRS-certified tax return listing tax information for the last 5 years (or for the last 3 years if you are applying on the basis of marriage to a U.S. citizen)
*Rent or mortgage payments and pay stubs."
