function verifydata(){
	var message = "";
	if (document.userlogin.username.value == "")
		message = "Your Username has been not been filled in.\n";
	if (document.userlogin.password.value == "")
		message = message + "Your Password has been not been filled in.";
	if (message.length != 0)
		{
		alert("There was a problem with your details, these are listed below :-\n\n" + message);
		return false;
		}
	else
		return true;
}