Block Attributes
textureFileXP
This attribute defines the texture file that the block will use for its x-positive side. Texture files for this attribute go into the textures/blocks directory of your mod.
Examples
// Uses textures/blocks/myBlockXP.png from the mod's directory
textureFileXP[0] = "myBlockXP.png";
// ...
// Uses textures/blocks/wood.png from the minecraft.jar
textureFileXP[15] = "/wood.png";
textureFileXP[0] = "myBlockXP.png";
// ...
// Uses textures/blocks/wood.png from the minecraft.jar
textureFileXP[15] = "/wood.png";