I want to modify the drop down menus for Marinelli (a Drupal theme)
The marinelli_menu.js on the marinelli theme folder is controlling the JavaScript.



The primary-links.css file is handling the theming.



Armed with this knowledge you can use Firebug to easily tweak the CSS and find out how it looks without having to save the file. And with Firebug's command line and debugging you can explore how those JavaScript functions behave and what's the best way to modify them if necessary.

If you don't know JavaScript or CSS then you have bigger issues.