help with collapse messages

hello people...is there any way to make a word a collapse list?

i mean if i add it on my widget it will says: Chat and when u click the Chat word to open a list of the Chat categorys

for example:

Chat about
.Books
.Movies
.Songs


so when someone click on the words: Chat about then it will show a list with book/movies/songs and when someone click on book to open a specific forum category with a href command

Might want to take a look at this.
http://www.developingwebs.net/html/dropdown.php

thank you very much i will look it now