This is the script include:

var AvMeetingPopulateLocation = Class.create();
AvMeetingPopulateLocation.prototype = {
    initialize: function() {

        /*This script contains hardcoded sys_ids. The only alternative 
        was to store each countries cmn_locations in sys_properties but
        this would make it complex to update in case new locations were
        required

        To add new locations, add the location sys_id to this.offices with
        a descriptive key and then call it from this.countryLocation in
        the relevant country object. Key cannot begin with a number and 
		should not contain spaces,
		
		Labels are initially invalid and then replaced by loop below for display
		If location record isn't found "invalid" will show in select box*/

        this.offices = {
			TowerDubai: { label: "invalid", id: "99fb64a5db807740adf3e2e15b961980" },
			GrosvenorHouse: { label: "invalid", id: "004eb4cd1bcf3b0007bf21ff6e4bcb51" },
			CanadaSquare: { label: "invalid", id: "96783ab4db40d4d445cdd06b68961958"},
			CentenarySquare: { label: "invalid", id: "80fba0a5db807740adf3e2e15b9619ea" },
			CorkStreet: { label: "invalid", id: "cdfb64a5db807740adf3e2e15b961942" },
			QueensRoadHK: { label: "invalid", id: "58fbe0a5db807740adf3e2e15b96196b" },
			TseungKwanOHK: { label: "invalid", id: "c451ea68db0814d4662ed8e74b961969" },
			HudsonNYC: { label: "invalid", id: "b748ac681bd56950b88ca609b04bcb59" },
			LarkinBuffalo: { label: "invalid", id: "f748ac681bd56950b88ca609b04bcb5a" },

	};
	// loop through this.offices getting correct labels
	for (var key in this.offices) {
		var grLOCN = new GlideRecord('cmn_location');
		if (grLOCN.get(this.offices[key].id)) {
			this.offices[key].label = grLOCN.getDisplayValue('name');
		}
	}
        this.countryLocation = {
            'uae': [
                this.offices.TowerDubai
            ],
            'unitedkingdom': [
                this.offices.GrosvenorHouse,
                this.offices.CanadaSquare,
                this.offices.CentenarySquare,
                this.offices.CorkStreet
            ],
            'hongkong': [
                this.offices.QueensRoadHK,
                this.offices.TseungKwanOHK
            ],
            'usa': [
                this.offices.HudsonNYC,
                this.offices.LarkinBuffalo
            ]
        };
    },


    populateLocation: function(location) {

        /*pass in the location value and use it to access the relevant
        country object and return the sys_ids*/

		var responseObj = JSON.stringify(this.countryLocation[location]);
		return responseObj
    },
    type: 'AvMeetingPopulateLocation'
};