permanent residents traveling to Canada and back?

Im planning a trip to Canada soon and need to know what documents i need?

Im a Green Card holder, have a DL, but my passport expired. Will I still be allowed into Canada and then back into the US with just my Green Card and DL?

Thank you

U.S. green card holders may travel to Catnada by LAND with just their green card and photo I.D. until June 1, 2009. After that a passport will be needed by all persons for all forms of travel to and from Canada. As a green card holder you are responsible to maintain a current passport from your home country at all times. You can apply for a new one through the nearest embassy or consulate of your home country in the U.S. You can firm that you do not need a passport at this time, or a visa to visit Canada by using the site below. Just enter your nationality, enter that you are an alien resident of the U.S.A., enter your destination and click for the info.