var suburbs_list = [];
suburbs_list['Kiev'] = ['s','www'];

$(function() {
   // handeling the search form
	$('#city').change( function() {
      if (this.selectedIndex==0) { // if no city selected
      	$('#suburb')[0].disabled = true;
      	$('#suburb')[0].selectedIndex=0;
      }
      else {
         var city = this.value;
         $('#suburb option').remove();
         $('#suburb')[0].disabled = false;
         $('#suburb').append('<option value="">any</option>');
         for (var i=0; i<suburbs_list[city].length; i++) {
         	$('#suburb').append('<option>'+suburbs_list[city][i]+'</option>');
         }
      }
	}).trigger('change');


});