Installation:

* Install Risugami's mod loader.
* Extract the xray package.
* Open .minecraft\bin folder.
* Open the "minecraft.jar" file with a archive manager program(7 zip, winrar etc).
* Drag the extracted files to the archive and overwrite if needed.
* If you didn't already, delete the META-INF folder from the archive.
* (Optional) Download and install NoVoidFog mod which deletes fog deep undergound.