[CODE]
$rsSections = CIBlockSection::GetByID(ИД_раздела);
$arSection = $rsSections->Fetch();
echo $arSection['IBLOCK_SECTION_ID'];
[/CODE]
$rsSections = CIBlockSection::GetByID(ИД_раздела);
$arSection = $rsSections->Fetch();
echo $arSection['IBLOCK_SECTION_ID'];
[/CODE]