How to use a function that takes arguments with jQuery's change() method?

I'm using jQuery version 1.5. I am looking at jQuery's change() function and specifically at this bit:

.change( [ eventData ], handler(eventObject) )
eventData: A map of data that will be passed to the event handler.
handler(eventObject): A function to execute each time the event is triggered.

What exactly is a "map of data" in JavaScript? How can I use the following test function as an event handler?

var myHandler = function(msg){alert(msg);};

I've tried this:

$("select#test").change(["ok"], myHandler);

and the alert reports [object Object]