[Javascript] drill down menu

[Anthony Webster]

hi all,

does anyone know how to create a drill down menu in javascript? something like the way windows explorer works on the left hand side - although I will have just a series of text links. I have a finite list of categories and sub categories in a left hand menu.

eg.

category 1
category 2
category 3

and clicking on category 2 gives

category 1
category 2
 category 2.1
 category 2.2
 category 2.3
category 3

thanks for your help

anthony