Making my own Minecraft Texture Pack?

These are the following files I have edited: terrain.png (blocks) kz.png (paintings) char.png (player skin) and several mob skins Usually I open minecraft.jar and delete/replace the corresponding files. Now I want my texture pack to show in the "texture packs" option on the title screen so I can... show more These are the following files I have edited:

terrain.png (blocks)
kz.png (paintings)
char.png (player skin)
and several mob skins

Usually I open minecraft.jar and delete/replace the corresponding files. Now I want my texture pack to show in the "texture packs" option on the title screen so I can have both the normal texture pack and my texture pack and easily alternate between them. Can I just put these edited files into the terrain folder?
Update: *I meant to say texturepack folder, not terrain folder.
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