Have minecraft version 1.0.0

Delete meta-inf
Install Modloader

Go to the folder "ToJar" and put the files of this folder in minecraft.jar

Go to the folder "ToArmor" and put the files of this folder in the folder "armor" located in the minecraft.jar

Go to the folder "ToGui" and put the files of this folder in the folder "gui" located in the minecraft.jar

This mod can crash if you have other mods (this mod is incompatible with some mods)