Since you're using ModLoader, your class has to be named like that: mod_*, otherwise it won't be loaded.
So you have to rename your class. In your case it'd be: mod_AT
Also, I'd recommend you to switch to Forge, it's so much better than ModLoader.
You my friend are now getting a rep point ive shown about 5 different people and it didnt work thank you and after this i am switching to forge