How to do Digg-like comments?

[Digerati]

Hi. I'm developing a traffic reports site and would like to have drop down windows like Digg.com has for comments. For example, the location of the incident would be in the title, then when they click that, the window drops down to show a map and further info. How do I make the drop down box?

Thank you.

Edit: I think I just found what I need: http://www.tutorio.com/tutorial/java...expanding-menu