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Bye.
First, get a program that can open jar files, such as 7-zip.
Then, use said program to open the minecraft.jar (Using the search command of your computer can ease the search)
Next, take the files that you extracted from modloader.zip and place them in the jar folder.
And finally, of course, delete the meta-inf from the jar.
This process will work for any mod, actually! Happy modding, and look out for conflicting ID's!