function lookupCityNames()
{
    var postalCode = $F('postalCode');
    var postalCodeTrimmed = postalCode.replace(/ /g, '');
    if(postalCodeTrimmed.length > 3){
	    var countrySelector = $('userCountryId');
	    if (!countrySelector) {
	    	countrySelector = $('country');
	    }
	    var country = "";
	    if(countrySelector){
		    var country = countrySelector.options[countrySelector.selectedIndex];
		    country = country.id;
		}
	    var url = "/portletController.do";
	    var params = 'portletName=lookupCityNamesPortlet&postalCode='+postalCodeTrimmed+'&country='+country;
	    var myAjax = new Ajax.Updater({success: 'cityNames'},url,{method: 'get', parameters: params});
	}

    return false;
}