How can I convert this "get_cities.php?country='+country" to CI way?

[eluser]shinokada[/eluser]
I have the following jquery which has url of get_cities.php?country='+country.

I am wondering how I should put this in CI way.

Can anyone teach me please?

$('#country').attr('value') will be ir or uk etc. And I can change it to 1, 2, 3 etc.

Code:

function update_cities(){
    var country=$('#country').attr('value');
    $.get('get_cities.php?country='+country, show_cities);
            }