I have downloaded the examples from the book, but cannot seem to get them to work. More specifically examples 16-4 thru 16-6. I would like to implement a dynamic text search box on my site similar to a Google search box. The html and php files don't seem to work together. Also, I noticed the code does not include a cross-browser function to determine if the client's browser is able to implement an XMLHttpRequest. How do I get the files to work?