This just replaces the diamond sword with a mithril battle-axe.
please comment if you like it and if you want me to replace more of the diamond gear with mithril stuff.
how o install for mac i don't have a pc
open you minecraft.jar with the unarchiver
rename the minecraft.jar to minecraftbackup.jar(or anything you want)
and then change the new minecraft folder to minecraft.jar
go to you gui folder and replace the items.png with the new item.png (don't forget to make a backup of the items.png if you want to change it back)
then test if it works
if the download does not work use this link