I have a small part of a paticular script that I can't understand, Can you help?

I have a small part of a paticular script that I can't understand, Can you help?

  1. { widget_id : $(widget).attr('id'), fetch: 1 };
This the paticular line I have truoble with. The script is from a 5 star rating system that does not use a database.. I got the script from here because I am new to JS so I got a head start.
I have my own Active video list beside the Flash player. I have the video list entries numbered and I want that number to set the stars that should be displayed.
      e.g. Watching Video no. 1
             See the Stars for Video no. 1

This script uses the id tag "r1", "r2" and I want to change that to "1", "2", "3" etc.
  1. <div id="r1" class="rate_widget">
On my html page:
I have a tag inside an A tag that has the .class="playing" so I can id the Video that is being watched using that. But I can't pull the existing script apart so I can put the new bit in..

In this script where is the id="r1" ? Is it a variable because I can't find it..
  1.     $(document).ready(function() {
            $('.rate_widget').each(function(i) {
                var widget = this;
                var out_data = { widget_id : $(widget).attr('id'), fetch: 1 };
                $.post(
                    'ratings.php',
                    out_data,
                    function(INFO) {
                        $(widget).data( 'fsr', INFO );
                        set_votes(widget);
                    },
                    'json'
                );
            });