function changeCountry() {
   if( $F('country_id') == 'US') {
      Element.show('state','state_label');
   }
   else {
      Element.hide('state','state_label');
   }
}

function changeZip() {
  if($F('zip').length == 5) {
    var url = 'index.php?u=ZipCodePage/getZip/' + $F('zip');
    xmlHttp(url,'city;state');
  }
}