[depp]

get_rubric = function ($_id, $_class,b)        
    {
       $.ajax({
           success: function(data)  {
                var html = '';
               for (key in (data.info)) {
                   html +='набираем данные';
               }
               $(b).html(html);

           }
       });
    } 
$(document).ready(function()
{
 
    get_rubric(0,"files",'#sidebar');

....