Nowadays, our society has entered into the information age, in which people intend to acquire the information as quickly as possible. The widely used World Wide Web can be featured by the high availability in Internet, short learning time in using the graphic interface browsers and open standard, and portability between different operating systems and platforms. The information released in the Internet is no longer limited to text and graphics as normally presented in the conventional textbooks. The linked material could be in a variety of formats including sound, picture, video, 3-D modeling, animation or application. When new packages of educational materials are developed, these characteristics are capable to enhance the feasibility of the standard HyperText Markup Language (HTML) generally used in the World Wide Web [1].
