var postcode_A = [ 4000,4001,4002,4003,4004,4005,4006,4007,4008,4009,4010,4011,4012,4013,4014,4017,4018,4019,4020,4021,4022,4029,4030,4031,4032,4034,4035,4036,4037,4051,4053,4054,4055,4059,4060,4061,4064,4065,4066,4067,4068,4069,4070,4072,4073,4074,4075,4076,4077,4078,4101,4102,4103,4104,4105,4106,4107,4108,4109,4110,4111,4112,4113,4114,4115,4116,4117,4118,4119,4120,4121,4122,4123,4124,4125,4127,4128,4129,4130,4131,4132,4133,4151,4152,4153,4154,4155,4156,4157,4158,4159,4160,4161,4163,4164,4165,4169,4170,4171,4172,4173,4174,4178,4179,4205,4207,4208,4209,4210,4211,4212,4213,4214,4215,4216,4217,4218,4219,4220,4221,4222,4223,4224,4225,4226,4227,4228,4229,4230,4270,4271,4272,4275,4280,4285,4287,4300,4301,4303,4304,4305,4500,4501,4502,4503,4520,4521 ];

var postcode_B = [      4306,4307,4309,4310,4311,4312,4313,4340,4341,4342,4343,4344,4345,4346,4347,4350,4370,4504,4505,4506,4507,4508,4509,4510,4511,4512,4514,4515,4516,4517,4518,4519,4550,4551,4552,4553,4554,4555,4556,4557,4558,4559,4560,4561,4562,4563,4564,4565,4566,4567,4572,4573,4575 ];


function addWeightCost(safeWeight, deliveryArea) {
        if (safeWeight <= 100) {

                // safes under 100kg
                if (deliveryArea == 'A') {
                        installCost = 180;
                } else {
                        installCost = 280;
                }

        } else if (safeWeight >= 101 && safeWeight <= 160) {

                // safes between 101kg & 160kg
                if (deliveryArea == 'A') {
                        installCost = 240;
                } else {
                        installCost = 340;
                }

        } else if (safeWeight >= 161 && safeWeight <= 260) {

                // safes between 161kg & 260kg
                if (deliveryArea == 'A') {
                        installCost = 300;
                } else {
                        installCost = 450;
                }

        } else if (safeWeight >= 260 && safeWeight <= 700) {

                // safes over 260kg and less than 700kg
                if (deliveryArea == 'A') {
                        installCost = 450;
                } else {
                        installCost = 600;
                }

        }

        return installCost;
}