Putting a fixed header in a jquery autoresponse dropdown

Putting a fixed header in a jquery autoresponse dropdown

In our Ruby on Rails app, we invoke JQuery autocomplete to perform a search whose results are displayed in a dropdown.

We'd like to have the first item of the dropdown function as a fixed header, and items 2-N be part of a scrollable list/div, etc.

Is this possible? Any hints or examples on how to do this?