Форум

echo '<pre>';
print_r($_GET);
echo '</pre>';

array(
    "CONDITION"   =>   "#^/catalog/#",
    "RULE"   =>   "",
    "ID"   =>   "bitrix:catalog",
    "PATH"   =>   "/catalog/index.php",
)

$url = $_SERVER['REQUEST_URI'];
$arguments = explode('/', $url);

$id_section = intval($arguments[3]);

if($id_section > 0) 
{ 
    $sql = CIBlockSection::GetByID($id_section); 
    if($result = $sql->GetNext()) 
    { 
        if($result['IBLOCK_SECTION_ID'] > 0)
        {
            $sql2 = CIBlockSection::GetByID($result['IBLOCK_SECTION_ID']);
            if($result2 = $sql2->GetNext()) 
            {
                $id_section = $result2['ID'];
            }
        }
        else $id_section = $result['ID'];
    } 
}

$sql_section = CIBlockSection::GetList(Array(), Array('IBLOCK_ID'=>$id_iblock, 'ACTIVE'=>'Y', 'SECTION_ID'=>$id_section)); 
if($result_section = $sql_section->GetNext()) 
{ 
    echo '<img src="'.CFile::GetPath($result_section['PICTURE']).'" alt="'.$result_section['NAME'].'" />'; // Изображение 
    echo $result_section['DESCRIPTION']; // Описание 
}