JavaScript Kit General JavaScript Tutorials http://www.javascriptkit.com/javaindex.shtml

Formatting numbers for decimals and significant digits
Generating weighed random numbers in JavaScript
Using the navigator object to detect client's browser
The Math object of JavaScript
Number rounding in JavaScript
Generating a random number in JavaScript 

Strings (text)
Math
Understanding arrays and loops



Generating a random number in JavaScript A popular question on the
JK Help
Forum is how to generate a random number in JavaScript. A random
number is useful if not required in the creation of certain
popular JS applications, such as a dice, random image script, or
random link generator. In this JavaScript article, we'll learn how
to output a random number that falls within the range 1 to x, where
x is any integer >1.
