function checkFields(form){

	if (form.firstname.value == ""){
		alert("Please enter your first name.");
		form.firstname.focus();
		return false;
	}
	
	if (form.lastname.value == ""){
		alert("Please enter your last name.");
		form.lastname.focus();
		return false;
	}
	
	if (form.email.value.indexOf('@') < 2){
		alert("Please enter a valid email address.");
		form.email.focus();
		return false;
	}
	
	if (form.comments.value == ""){
		alert("Please enter your questions or comments.");
		form.comments.focus();
		return false;
	}

	return true;
}