function postcode_check (cityToCheck,stateToCheck,postcodeToCheck) { 
var postcode = parseInt($(postcodeToCheck).val(),10);
var city = encodeURI($(cityToCheck).val().toUpperCase());
var state = encodeURI($(stateToCheck).find("option:selected").text().toUpperCase());
var URL = "http://www.nps.org.au/forms/pc_results?p="+postcode+"&c="+city+"&s="+state;
var results = Ajax.get (URL);
	if (results >= 1) { 
		return true; 
	} else {
		return false; 
	}
}