Plugin download
How to use ItemsAdder items in the GUIs
material: 'source:ITEMADDER:itemId'
material: 'source:IA:anotherItemId'
How to retexture the GUI background
Title: '%img_offset_-16%%img_blank_menu%'
Basically %img_offset_-16% is used to shift back the texture %img_blank_menu%by 16 pixels.
