I need help with coding JavaScript DHTML Collapsible List

[amerex05]

Hello,

I fiugured out how to create a drop down collapsible list with a closed folder next to each link, however, now I wanna apply a folder which opens on click. It's the exact way it's done on Webmonkey.com.There's a tutorial on web monkey that shows you had to do this, but I get lost at the end part for applying the open folder on click. I tried it but I can't seem to get it to work.

I was hoping someone could clear this up for me and show how exact how to do it.

Here's the page I am working on for it.

Http://certtech.ca/tutorials.htm

Thanks