Advanced Methods
		Hypertext Markup Language (HTML) is a easy to use because it is limited in what it can do. If one wants to implement more sophisticated things like Web pages that interact creatively with the user rather than just delivering content, it is necessary to go beyond HTML. Some of the most common ways to do this employ Javascript, CGI scripts, or Java applets. We'll take a brief look at these three topics in this chapter. We'll also introduce two new HTML topics, frames and style sheets, and show you how you can begin to use these with your web pages. Finally, we end the chapter with a brief introduction to Flash 4, a powerful yet inexpensive and easy to use commercial product that allows you to create high quality interactive animations for the web. Javascript Java Applets Frames Flash 4 Style Sheets   CGI and Forms Going Further Java and CGI programs have enormous potential for educational applications because they can provide a much greater level of interaction than mere HTML. Writing Java or CGI programs is beyond the scope of the present Tutorial, but you can learn to use Java and CGI programs written by others without much difficulty. Javascript is perhaps easier to learn than the other two languages, but it is also not as powerful. We begin the chapter by looking at some simple examples of what you can do with Javascipt.