Doors and Windows - Sliding windows

Sorry, another question! My house has a room addition that has 8 sliding windows. We bought the house 2 years ago and are unsure how old the addition is. The problem is that the windows have condensation in between the glass panels and some look foggy. Is there a way to fix this without purchasing new windows? Does it sound like a broken seal? Thanks!

The seals in the IG units are shot. Only fix is to replace the IG units. These will have to be ordered through a glass shop, and should take about a week to get. Start with the sliding sashes. Remove them and take them to a glass shop. They will measure them and order exact replacements. Talk to them about the best way to deal with the fixed panes -- you can't take them to the shop! They need to get measured also -- either you do it or the guys at the shop will have to come do it. But, since they now have the thickness, all you would have to come up with is the hieght and width. Should be fairly easy to get that.