How do I add a new drop down to the menu

[blueuniverse]

At the top, my menu is getting quite crowded, and I want to tidy it up by putting some of the links into drop downs, like there is currently with the search and quick links.

Whenever I try to replicate the code for those though, I get errors or it doesn't work in some way.

Is there an easy way to do this, some code I could use?