дык там же написано
метод GetCategory() вызван без аргумента.

class Realty
{
	private $id;
	private $id_realty_category;
	private $date_created;
	private $datetime_created;
	private $code;
	private $real_code;
	private $contacts;
	private $region;
	private $street;
	private $rooms;
	private $walls;
	private $material;
	private $floor;
	private $floors;
	private $area;
	private $live_area;
	private $kitchen;
	private $phone;
	private $design;
	private $description;
	private $price;
	private $logo;
		
	public $output_stream;
		
	function __construct($id='')
	{
		if ($id)
		{
			$query = "SELECT * FROM realty WHERE id_realty = '".$id."'";
			@ $result = mysql_query($query);
			if ($result)
			{
				while ($row = mysql_fetch_array($result))
				{
					$this->id = $row['id_realty'];
					$this->id_realty_category = $row['id_realty_category'];
					$this->date_created = $row['date_created1'];
					$this->datetime_created = $row['datetime_created'];
					$this->real_code = $row['real_code'];
					$this->contacts = $row['contacts'];
					$this->region = $row['region'];
					$this->street = $row['street'];
					$this->rooms = $row['rooms1'];
					$this->walls = $row['walls'];
					$this->material = $row['material'];
					$this->floor = $row['floor1'];
					$this->floors = $row['floors'];
					$this->area = $row['area'];
					$this->live_area = $row['live_area'];
					$this->kitchen = $row['kitchen'];
					$this->phone = $row['phone'];
					$this->design = $row['design'];
					$this->description = $row['description'];
					$this->price = $row['price1'];
					$this->logo = $row['logo'];
				}
				
			} else {
				Streams::Append('error','Query: '.$query);
			}
		} else {
			$this->id = '';
			$this->id_realty_category = '';
			$this->date_created = date('Y-m-d');
			$this->datetime_created = date('Y-m-d H:i:s');
			$this->real_code = '';
			$this->contacts = '';
			$this->region = '';
			$this->street = '';
			$this->rooms = '';
			$this->walls = '';
			$this->material = '';
			$this->floor = '';
			$this->floors = '';
			$this->area = '';
			$this->live_area = '';
			$this->kitchen = '';
			$this->phone = '';
			$this->design = '';
			$this->description = '';
			$this->price = '';
			$this->logo = '';
		}
	}
	
	
	function GetLogo(){return $this->logo;}
	function GetReal_code() {return $this->real_code;}
	function GetContacts() {return $this->contacts;}
	function GetRegion() {return $this->region;}
	function GetStreet() {return $this->street;}
	function GetRooms() {return $this->rooms;}
	function GetWalls() {return $this->walls;}
	function GetMaterial() {return $this->material;}
	function GetFloor() {return $this->floor;}
	function GetFloors() {return $this->floors;}
	function GetArea() {return $this->area;}
	function GetLive_area() {return $this->live_area;}
	function GetKitchen() {return $this->kitchen;}
	function GetPhone() {return $this->phone;}
	function GetDesign() {return $this->design;}
	function GetPrice() {return $this->price;}
	function GetDescription() {return $this->description;}
	function GetDate_created() {return $this->date_created;}
	function GetIdRealtyCategory () {return $this->id_realty_category;}
	
	
	function GetCategory($id_realty_category) {
	$query = "SELECT * FROM realty_category WHERE id_realty_category = '".$id_realty_category."'";
			
				while ($row = mysql_fetch_array($result))
				{
					$this->title = $row['title'];
				}
			
					
	}	

подскажите, где ошибка?

ошибка не в классе, а там где вызывается метод
Z:\home\vipagent.com.ua\www\ru\realty.php on line 26
у метода есть аргумент - $id_realty_category

function GetCategory($id_realty_category) {
	$query = "SELECT * FROM realty_category WHERE id_realty_category = '".$id_realty_category."'";
			
				while ($row = mysql_fetch_array($result))
				{
					$this->title = $row['title'];
				}
			
					
	}	

а вызывается видимо без

тебе написали выше.

Ругается на функцию:

Realty::GetCategory()

Смотрим код:

function GetCategory($id_realty_category) {

Вызываем таким образом:

Realty::GetCategory(2) // любой id

Вот где я вызываю эту функцию, это уже вне класса, это именно загрузка странички
Подскажите что я не так сделал? хочу сразу заметить id_realty_category имеет в таблице цифровой параметр, тоесть просто обозначение там например 1 или 2, а вот во второй таблице бд, этот параметр 1 или 2 имеет название категории. вот мне со второй таблицы не получается вытянуть название сюда.......

<?
require_once '_init.php';

$code = (isset($_GET['id'])) ? substr($_GET['id'],0,20) : 0;
$code = str_replace('/','',$code);

if($_GET['cat']!="") { $cat=$_GET['cat']; }
$cat = str_replace("/", "", $cat);




if ($cat || $code)
{
	/*** Задан йд страницы и такой объект недвижимости существует**/
	if($code and Realty::Exists($code))
	{
		$page = new Realty($code, $cat);
		$logo = str_replace("/uploads","/uploads",$logo);
		$tpl = new Template('realty_obj');
		$tpl->Set('{HEAD}',Template::LoadStatic('head'));
		$tpl->Set('{TITLE}',($title ? $title.' | ' : '').$SITE_TITLE);
		$tpl->Set('{LEFTMENU}',Template::LoadStatic('leftmenu'));
		$tpl->Set('{LOGO}',$page->GetLogo());
		$tpl->Set('{EXTRA}',$page->GetDescription());
		$tpl->Set('{CODE}',$page->GetReal_code());
		$tpl->Set('{REAL_CATEGORY}',$page->GetCategory());
		$tpl->Set('{CONTACTS}', $page->GetContacts());
		$tpl->Set('{REGION}', $page->GetRegion());
		$tpl->Set('{STREET}', $page->GetStreet());
		$tpl->Set('{ROOMS}', $page->GetRooms());
		$tpl->Set('{MATERIAL}', $page->GetMaterial());
		$tpl->Set('{FLOOR}', $page->GetFloor());
		$tpl->Set('{FLOORS}', $page->GetFloors());
		$tpl->Set('{AREA}', $page->GetArea());
		$tpl->Set('{LIVE_AREA}', $page->GetLive_area());
		$tpl->Set('{KITCHEN}', $page->GetKitchen());
		$tpl->Set('{PRICE}', $page->GetPrice());
		$tpl->Set('{WALLS}', $page->GetWalls());
		$tpl->Set('{DESIGN}', $page->GetDesign());
		$tpl->Set('{PHONE}', $page->GetPhone());
		$tpl->Set('{DATE_CREATED}', $page->GetDate_created());
		$tpl->Set('{CONTENT}',$description);
		require 'advice.php';
		require 'rightside_r.php';
		$tpl->Set('{LANG}',$LANG);
		$tpl->Display();
		exit;
		
	} elseif ($cat != "" && Realty::CatExists($cat) === true) {
		/* Задан вид сделки и такая категория существует */
		$realty_list = Realty::GetHeadersr4(array('rubrics' => $cat, 'get' => array('id_realty_category','date_created1', 'real_code', 'contacts', 'region', 'street1', 'rooms1', 'walls', 'material', 'floor1', 'floors', 'area', 'live_area', 'kitchen', 'phone', 'design', 'description', 'logo',)));
		$realty_list_template = Template::LoadStatic('real_obj');
		$realty_list_HTML = '';
		if ($realty_list) foreach ($realty_list as $realtyline)
		{
		    
			$tmp = $realty_list_template;
			$tmp = str_replace('{LOGO}', $realtyline['logo'], $tmp);
			$tmp = str_replace('{REGION}', $realtyline['region'], $tmp);
			$tmp = str_replace('{STREET}', $realtyline['street'], $tmp);
			$tmp = str_replace('{ROOMS}', $realtyline['rooms1'], $tmp);
			$tmp = str_replace('{AREA}', $realtyline['area'], $tmp);
			$tmp = str_replace('{PRICE}', $realtyline['price1'], $tmp);
			$tmp = str_replace('{CODE}', $realtyline['real_code'], $tmp);
			$tmp = str_replace('{REAL_CATEGORY}', $rubrics['title'], $tmp);
			$tmp = str_replace('{DESCRIPTION}', $realtyline['description'], $tmp);
			$tmp = str_replace('{DATE_CREATED}', $realtyline['date_created1'], $tmp);
			
			
			$realty_list_HTML .= $tmp;
		}

		$realty_category = Realty_category::Load($cat);
		
		$tpl = new Template('content');
		$tpl->Set('{KEYWORDS}','');
		$tpl->Set('{DESCRIPTION}',$page->GetLogo());
		$tpl->Set('{TITLE}',$realty_category['title'].' | '.$SITE_TITLE);
		$tpl->Set('{LEFTMENU}',Template::LoadStatic('leftmenu'));
		$tpl->Set('{PAGETITLE}',$realty_category['title']);
		$tpl->Set('{CONTENT}',$realty_list_HTML);
		$tpl->Set('{REGION}', $realtyline['region']);
		$tpl->Set('{CODE}', $page->GetReal_code());
		$tpl->Set('{DESCRIPTION}',$realtyline['description']);
		$tpl->Set('{CONTENT}',$news_list_HTML);
		require 'advice.php';
		require 'rightside_r.php';
		
		$tpl->Set('{LANG}',$LANG);
		$tpl->Display();
		exit;
	} else {
		header("HTTP/1.0 404 Not Found");
		$tpl = new Template('content');
		$cat = str_replace("/", "", $cat);
		$tpl->Set('{KEYWORDS}','');
		$tpl->Set('{DESCRIPTION}','');
		$tpl->Set('{LEFTMENU}',Template::LoadStatic('leftmenu'));
		$tpl->Set('{PAGETITLE}','Недвижимость');
		$tpl->Set('{TITLE}','Недвижимость | '.$SITE_TITLE);
		$tpl->Set('{CONTENT}',"Недвижимости <b>".$cat."</b> не найдено");

		require 'advice.php';
		require 'rightside_r.php';
		
		$tpl->Set('{LANG}',$LANG);
		$tpl->Display();    
		exit;
	}
} else {
	$tpl = new Template('content');
	$tpl->Set('{HEAD}',Template::LoadStatic('content'));
	$tpl->Set('{KEYWORDS}','');
	$tpl->Set('{DESCRIPTION}','');
	require 'advice.php';

	$tpl->Set('{LEFTMENU}',Template::LoadStatic('leftmenu'));
	$tpl->Set('{PAGETITLE}','Недвижимость');
	$tpl->Set('{TITLE}','Недвижимость | '.$SITE_TITLE);
	
	
?>

ну так вот же ошибка

$tpl->Set('{REAL_CATEGORY}',$page->GetCategory());

вызов метода без аргумента :)

Oliver Varnce вроде на форуме, не первый день, а правила еще не "выучил" Делаю первое предупреждение, давай осмысленный заголовок своим темам, иначе будет мусор на форуме.

2 velbox Sorry!