Extend JQuery with function

Extend JQuery with function


Hi,
A newbie question, I'm afraid...
I have extended sortables with my own function which works fine as an
onlcick event.
However, I need the function to be fired off when a box has been moved
(ie the DOM has finished being updated) because I find the position of
the boxes and write to a db. I tried the mouseup event but it is too
early as the DOM isn't finished.
The fact it is a new function is irrelevant as I could have wanted to
use 'serialise' to grab the positions into a cookie or whatever. But
where would this call go?
I currently have:
<script type="text/javascript">
jQuery.fn.serialize_mis = function()
    {
    var divs = document.getElementsByTagName("div");
    var fullid = ' ';
    var shortid = ' ';
    var str = ' ';
    var url = boxes_update.php?staff_code=x';
    var i;
    var y = 0;
    for (i=0;i<divs.length;i++)
        {
        fullid = divs[i].getAttribute("id");
        shortid = fullid.substring(0,3);
        if (shortid == 'box')
            {
            str = str.concat(fullid,'-');
            }
        }
    url = url.concat(staff_code,'&ord=',str);
    //alert(url);
    ajaxgo(url); // go off and update the database
    };
$(window).bind("load",function(){
    $("#container").sortable({
        revert: true,
        scroll: true,
        placeholder: 'hover', //the class te placeholder should have
        placeholderElement: '> div'
    });