Autocomplete aliases

Autocomplete aliases

Hey

I'm using the jQuery UI Autocomplete in my form and everything's working fine (thanks to the community).
There's just one thing left to make it perfect... aliases.

Example: 
The autocompleted field is for the user to enter his country. One autocomplete option is "United States of America". How can I do it such that if the user types in the acronym "USA", the autocompleter associates it with the "United States of America" value?

In other words, is there a way to create an alias when I define the countries in my list (countries variable)?
list:

var countries = [
"United States of America",
"United Kingdom",
....
]

any help greatly appreciated, thanks
Wahooo