function changeRegion(location_id, suburb_id) {
  var sel = document.getElementById('suburb_id');
  sel.length = 0;

  sel.options[0] = new Option('All suburbs', '');

  if(location_id) {  
    sel.disabled = '';
    var vals = location_hash[location_id];
    for(i = 0; i < vals.length; i++) {
      var arr = vals[i].split("|");
      sel.options[i+1] = new Option(arr[1], arr[0]);
      //alert(arr[0]);
      if(arr[0] == suburb_id) {
        sel.options[i+1].selected = "selected";
      }
    }
  }
  else {
    sel.disabled = 'disabled';
  }
  
}