Prototype and Multiple Drop Downs

[eluser]ccachor[/eluser]
So I'm doing some drop downs but I can't seem to get my controller to accept the post value from my form. Here's what my jscript looks like

Code:

function getModels(){

    var url = 'http://localhost/dropdown/getModels/';

    var pars = $F('make');

    var myAjax = new Ajax.Request(url, {

            method: 'post',

            parameters: pars,

            onSuccess: successModels

        });

}

My controller

Code:

function getModels()

    {
        
        $make  = $this->input->post('make');
            
        $data['query'] = $this->db->query('select distinct model from inventory where make = "$make" ');
                        
        $this->load->view('dropdowns/models', $data);
            
      }

In Firebug the post displays what I want it to but for some reason it won't set for the SQL. I'm thinking it has something to do with the URI stuff or something. I can't figure it out! BTW my select id in my html is all correct. Just think it has something to do with CI.