function checkForm(formName) {
	var alertMessage = "";
	
	if (formName.first_name.value == "") {
		alertMessage = "\n - First name";
	}		
	if (formName.last_name.value == "") {
		alertMessage += "\n - Last name";
	}		
	if (formName.address.value == "") {
		alertMessage += "\n - Address";
	}		
	if (formName.city.value == "") {
		alertMessage += "\n - City";
	}		
	if (formName.state.value == "") {
		alertMessage += "\n - State";
	}		
	if (formName.zip.value == "") {
		alertMessage += "\n - Zip/Postal Code";
	}		
	if (alertMessage != "") {
		alert("The form was not submitted because the following field(s) are required:\n" + alertMessage);
		return false;
	} else {
		return true;
	}
}