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

		int found = 0;

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