Create a Drop-Down list using JavaScript and CSS/nl

Requirements
Ability to change your MediaWiki:Common.js and MediaWiki:Monobook.css

Code / Menu / Listing Used in Wiki Example
 NameofLink  Option1  Option2  Option3  Option4  Option5 

Thus creating a fully functional drop down list in your specified location.

Sample Code:

 Shortcuts  Carnivores </li> Herbivores </li> Reptiles </li> Amphibians </li> Mammals </li></ul></li></ul></ul>