A friend told me that you can put 1.6 and 1.7 mods in the mod folder together and they will work fine, but when I did it they cancelled out one another, is it possible to do this and I did something wrong or am I just wasting my time?
I suppose that would depend on the mods and what they do. You choulkd check out the documentation for each mod and see what they say. Also you may want to try adding one mod at a time and checking to see if it works. Also, for anyone to help you better you'll want to check out the link below and post all of the information that it's asking for. That way we know what you're trying to do.
http://www.minecraftforum.net/topic/1524657-how-to-ask-for-help/