function validate(thisForm) {
with (thisForm) {
var alertMessage = "You must include:\n";

if (first_name.value == "") alertMessage += "\nFirst name";
if (last_name.value == "") alertMessage += "\nLast name";
if (address1.value == "") alertMessage += "\nAddress";
if (city.value == "") alertMessage += "\nCity";
if (county.value == "") alertMessage += "\nCounty";
if (country.value == "") alertMessage += "\nCountry";
if (post_code.value == "") alertMessage += "\nPost/Zip code";
if (email_address.value == "") alertMessage += "\nEmail address";
if (username.value == "") alertMessage += "\nUsername";
if (password.value == "") alertMessage += "\nPassword";

if (alertMessage != "You must include:\n") {
alert(alertMessage);
return false;
} else return true;
} }