Chapter 10 - Javascript 101
The 'Hello World' program.
This line was created from within JavaScript.
Prompting for user input with a dialog.
You said that your name is 'null'
Converting a string to a number.
Your number is 'NaN'.
Its square root is 'NaN'.
JavaScript in Firefox
Look at the "JavaScript Console"
and the "DOM Inspector" in the Tools menu.
We'll be using these to fix our programs when they break.
Also check out "View Generated Source" in the Web Developer
toolbar under "View Source".