how to make a callbacks work in the liveapi js?

Hi,

Im trying to work out how basic callbacks work in the js liveapi. Im using the following sample code but cant even seem to get a basic callback to work. My understanding is that the way this is supposed to work, is that I give the function an id and it listens to changes on that id and will output a result if a change occurs. However, when i delete the device with the id, it doesnt output anything. Any help understanding this would be much appreciated.

inlets=1;
outlets=2;

function list()
{
var input;
if(inlet==0)
input=arrayfromargs(arguments); // makes an array called "input" from the input list
post("the list contains",arguments.length, "elements"); // how many elements ( ids ) has our input list
post(input[0]); // post the first element (id) just to check its working

var api = new Array();

for (n=0;n