creating a dropbox?

[Chicago_VLNU_4s]

I would like to create a drop down box. Not your ordinary drop down like the example here > http://www.javascriptkit.com/javatutors/dombos1.shtml but more like when you click "User CP" or "Help" here. If you look on that site, you will see "Javascript" double underlined and when you hover over it, a drop box shows up. Well that's what I'm some what referring to. I just want to type a paragraph or so for a certain link on my mainpage so when someone hovers over it, the drop down box shows the paragraph. Keep in mind, this isn't for vbulletin, it's for regular html.

Any help would be appriciated!