[jQuery] Using AutoCompleter, how do you pass parameters

[AtlantaGeek]

I'm using a modification of Dylan Verheul's AutoCompleter that can be
found at http://www.pengoworks.com/workshop/jquery/autocomplete.htm.
I need to pass not only the user's input, but the customer number.  On
a full hit, I know it from the logged in user, on an AJAX call I need
another way to determine it.  Perhaps there is a better/easier way,
but I was just going to put the customer number in a hidden form field
and then pass it via the AJAX call.

So I have this form field:

<input type=hidden id="CustNo" name="CustNo" value="791823">

The AutoComplete section of the JavaScript is:

$(document).ready(function() {
        $("#txtItem").autocomplete("itemquery.abc?&CustNo="+$
('#CustNo').val(),
                {
                        delay:10,
                        minChars:2,
                        matchSubset:1,
                        matchContains:1,
                        cacheLength:10,
                        maxItemsToShow:15,
                        width:500,
                        onItemSelect:selectItem,
                        onFindValue:findValue,
                        formatItem:formatItem,
                        autoFill:true
                }
        );

But then the QueryString as seen on the backend is:

CustNo=791623?q=12

Normally what I see on the back end would be more like:

CustNo=791623&q=12

and I could extract the customer number with no problem.  Actually, I
still can, however I'd like the query string to be built properly so
that it's:

q=12&CustNo=791623

I'm very new to JQuery.  Can I make this work?

Thanks.