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Your first approach to introducing Ajax functionality into the Duke's Bookstore application was do-it-yourself: you hand-coded JavaScript and CSS files on the client side and wrote a servlet to service the Ajax XMLHttpRequest on the server.

The do-it-yourself approach works well enough for simple projects, but as your project grows you want to find an approach that requires less client-side coding. For your second attempt to implement pop-up balloons in your application, you use one of the available JavaScript libraries to minimize the amount of JavaScript code you need to write.

In this article, you use the JavaScript libraries available with the Dojo Toolkit. The Dojo Toolkit provides a comprehensive set of JavaScript libraries and is receiving industry support from companies such as Sun Microsystems, AOL, and IBM. The Dojo Tookit is the logical choice for your project. Note that adopting Dojo libraries doesn't preclude other solutions. If at some point the Dojo libraries don't provide required functionality, they can be combined with libraries from other sources.

One advantage of using Dojo libraries is that they are designed to work with various browsers when desired functionality is missing.

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