If you are certain that both switches worked correctly at first (you could turn the light on or off from either switch with the other switch in either position) then you have a bad switch. But if you aren't certain of this, it is likely that you wired one or both switches incorrectly. There are lots of great write-ups to be found if your google - how to wire a three ways switch --- But I like this one. http://home.howstuffworks.com/three-way2.htm
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