My wife and I just bought our first house with original 88 year-old hardwood floors in them. The current owner has refinished them and most of the floor is in great condition. Unfortunately a previous owner did not take very good condition of the floors and there are large dark stains in various areas. Both a friend of ours and our realtor said they think it is discoloration due to the sun. Here is a link to a picture of what's probably the worst area: http://lh3.ggpht.com/_T_HQ9glHYFo/S6QF3_A_vLI/AAAAAAAAAcA/VmwfiFfGbl0/s800/NewHouse-12.jpg
Is there anything that can be done to get rid of these spots?