public static boolean hasItem(EntityPlayer player, ItemStack is) {
		if(is == null)
			return false;

        for (ItemStack stack : player.inventory.mainInventory) {
        	if(stack != null) {
        		if(ItemStack.areItemStacksEqual(stack, is)) {
        			return true;
        		}
        	}
        }
        return false;
	}