How can I add a parameter to an autocomplete with jQueryUI

How can I add a parameter to an autocomplete with jQueryUI

Dear All,

I am trying to use two autocomplte following this exemple
http://af-design.com/blog/2010/05/12/using-jquery-uis-autocomplete-to-populate-a-form/

First I am extract data to have the Brand of cars (this works)
  1. // Autocomplete marque
        var ac_marques = {
            source: 'http://www.website.com/manager/templates/name/xmlhttprequest/autocomplete-marques.php',
            minLength: 1,
            select:function(event, ui){
                $("#h_marque").val(ui.item.id); // That hidden field wil contain the id of the brand car
                $("#f_modele").show();
            }
        };
        $(".fmarque").autocomplete(ac_marques);
    //FIN Autocomplete marque









When it's done, it display the brand label and in the hidden filed #h_marque contains the id of the brand. Let's say we have the id "32"


Then I want to extract the model of the brand car. For exemple, if I have "Audi", I would like to have only the models of Audo. For the I need to use the value of the hidden field "h_marque"

Here is my code to extarct the model, but I do not know how I can add a parameter to the source.
  1. // Autocomplete modeles
        var ac_modeles = {
            source: 'http://www.website.com/manager/templates/name/xmlhttprequest/autocomplete-modeles.php?marque=' + $("#h_marque"), // This does not work
            minLength: 1,
            select:function(event, ui){
                $("#h_modele").val(ui.item.id_modele);

            }
        };
        $(".fmodele").autocomplete(ac_modeles);
        //FIN Autocomplete marque









How can I replace this

source: 'http://www.website.com/manager/templates/name/xmlhttprequest/autocomplete-modeles.php?marque=' + $("#h_marque"), // This does not work
How can I properly send the parameter "marque" to the file autocoplete-modeles.php and filter my database to have only the models of the selected brand?


Many thank for your help

Cheers