private String randpwd() {
		String charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
		StringBuilder buf = new StringBuilder();
		for (int i = 0; i < 8; i++)
			buf.append(charset.charAt((int) (Math.random() * charset.length())));
		return (buf.toString());
	}