// County lists
var cities = new Array();

cities['Loudoun County'] = new Array('Aldie','Ashburn','Leesburg','South Riding','Sterling Park','Sterling');
cities['Fairfax County'] = new Array('Alexandria','Annandale','Arlington','Burke','Centreville','Chantilly','Clifton','Dunn Loring','Fairfax','Fairfax Station','Falls Church','Fort Belvoir','Great Falls','Herndon','Lorton','Manassas','McLean','Oakton','Reston','Springfield','Vienna');
cities['Prince William County'] = new Array('Bristow','Dale City','Dumfries','Gainesville','Haymarket','Lake Ridge','Nokesville','Occoquan','Woodbridge');
cities['Montgomery County'] = new Array('Bethesda','Chevy Chase','Rockville','Takoma Park','Gaithersburg','Germantown','Kensington','North Potomac','Potomac','Silver Spring','Wheaton');
cities['Howard County'] = new Array ('Columbia');
cities['Charles County'] = new Array ('Waldorf');


function setCities() {
  cntySel = document.getElementById('county');
  cityList = cities[cntySel.value];
  changeSelect('city', cityList, cityList);
  }


function changeSelect(fieldID, newOptions, newValues) {
  selectField = document.getElementById(fieldID);
  selectField.options.length = 0;
  for (i=0; i<newOptions.length; i++) {
    selectField.options[selectField.length] = new Option(newOptions[i], newValues[i]);
  }
}

// Multiple onload function created by: Simon Willison
// http://simonwillison.net/2004/May/26/addLoadEvent/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  setCities();
});