Why is script.text set to quoted code?
Surely the double quotes are incorrect in the catch block.

You have
var code = "function sayHi() {alert('hi');}";

Then later script.text = "code";

surely
script.text = code is the solution.

code should not be quoted. This issue was reported on the errata page:

http://www.wrox.com/WileyCDA/WroxTit...Cd-ERRATA.html

__________________
Nicholas C. Zakas
Author, Professional JavaScript for Web Developers (ISBN 0764579088)
http://www.nczonline.net/