var a_values = new Array();
a_values["AF:All"] = new Array('KBL:Kabul','US:New york');
a_values["AL:All"] = new Array('TIA:Tirana');

var abbreviations = new Array();
abbreviations['AF'] = new Array();
abbreviations['AF']['KBL'] = 'Kabul';
abbreviations['AF']['US'] = 'New York';
abbreviations['AL'] = new Array();
abbreviations['AL']['TIA'] = 'Tirana';

JSON.stringify(abbreviations).indexOf('Kabul') >= 0

var a_values = {};

var find = 'Kabul';
var found = false;
$.each(a_values, function(key, value){
  if (value.indexOf(find) != -1) {
    found = true;
    return false; // skip rest of the loop
  }
});