public void registerBlockIcons(IIconRegister iconRegister) {
icon_upper = new IIcon[2];
icon_lower = new IIcon[2];
icon_upper[0] = iconRegister.registerIcon(Extrabiomes.TEXTURE_PATH + getTextureName() + "_upper");
icon_lower[0] = iconRegister.registerIcon(Extrabiomes.TEXTURE_PATH + getTextureName() + "_lower");
icon_upper[1] = new IconFlipped(icon_upper[0], true, false);
icon_lower[1] = new IconFlipped(icon_lower[0], true, false);
}