Use an empty salt pail, some string, fish line, or coat hanger to hang a pop can, fill with about 5 inches water, some peanut butter on the pop can, and a board for the mice to walk up to the edge of the pail and jump onto the pop can. You'll probably catch them all the first night, using this method.
http://www.youtube.com/watch?v=5SWoTwXxO1Y