Does ayone know

Hey, does anyone know how to make those fancy little drop down boxes like I have on my side bar for my blog archives? That one came pre-made with the beta blogger layouts. I would like to have one to use to put all of my categories in and also one where I can list all of my favorite blogs. Any help would be great. If you don't want to explain it here email please. The email is on my profile.
Thanks!