Try this:
package com.CraigTheMailman.MinecraftExpansion.blocks;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.IIcon;
import net.minecraft.world.World;
import com.CraigTheMailman.MinecraftExpansion.MinecraftExpansion;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
public class WorkSurface extends Block {
@SideOnly(Side.CLIENT)
private IIcon workSurfaceTop;
public WorkSurface(Material wood) {
super(Material.wood);
this.setHardness(3.5F);
this.setResistance(5.0F);
this.setCreativeTab(MinecraftExpansion.tabK);
}
@SideOnly(Side.CLIENT)
public IIcon getIcon (int side, int metadata) {
return side == 1 ? this.workSurfaceTop : this.blockIcon;
}
@SideOnly(Side.CLIENT)
public void registerBlockIcons (IIconRegister iconRegister) {
this.blockIcon = iconRegister.registerIcon("MCExpansion:CustomMech1_Side");
this.workSurfaceTop = iconRegister.registerIcon("MCExpansion:CustomMech1_Top");
}
public boolean onBlockActivated (World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
if(!player.isSneaking() && !world.isRemote) {
FMLNetworkHandler.openGui(player, MinecraftExpansion.instance, MinecraftExpansion.guiIDCustom1, world, x, y, z);
}
return true;
}
}