Want help to use jquery tree view

Code:
global $menu_array ;

foreach ($result as $rowdata)

{

 $menu_array[$rowdata->course_id] = array(

  'id' => $rowdata->course_id, 

  'category' => $rowdata->course_name, 

         'parent_id' => $rowdata->parent_id ); 

 }

generate_menu($menu_array,0);

function generate_menu($arr, $parent)

{    

    $has_childs = false;

    foreach($arr as $key => $value)

    {

 if ($value['parent_id'] == $parent) 

        {       

  if ($has_childs === false)

  {

       $has_childs = true;

  echo '<ul id="browser" class="treeview">';

  }

 echo '<li class="expandable"><div class="hitarea expandable-hitarea"></div><a href="/url/' . $value['category'] . '" title="">' . $value['category'] . '</a>';

 generate_menu($arr, $key);



 echo '</li>';

 }

 }

 if ($has_childs === true) echo '</ul>';

}