первая страница
function  main_page()
	{
		$link = connect_db("client_base");
			echo '<br/><br/>';
		
		$rows = mysql_query("SELECT * FROM first_items ORDER BY id_first");
		if(!$rows)
			echo ",не судьба(((";
		else
		{
			while($data = mysql_fetch_assoc($rows))
			{
				echo '<img src = "../i/list.gif" style = "padding-right: 5px;">
<a href = "directory.php?FId='.$data['id_first'].'" style = "font-size: 14px;" >'.$data['first_description'].'</a><br/>';
				
			}
		}
		
	}
	
	
	
	//вывести главный рубрекат для второй страницы при нажатии на ссылку 
	function main_page_next()
	{
	$num = $_GET['FId'];
	$link = connect_db("client_base");
	$row_d = mysql_query("select *from first_items where id_first = '$num'");
	$bufer_d = mysql_fetch_array($row_d);
	echo '<font><a href = "index.php" style = "font-size: 12px;">Главная</a> > '.$bufer_d['first_description'].'</font>';
	echo '<br/><br/>';
		$rowsSecond = mysql_query("SELECT * FROM second_items WHERE id_first = '$num'");
									  
					   while($dataSecond = mysql_fetch_assoc($rowsSecond))
					   {
					    	echo '<img src = "../i/list.gif" style = "padding-right: 5px;">
<a href = "client.php?FId = '.$num.'&SId = '.$dataSecond['id_second'].'" style = "font-size: 14px;">'.$dataSecond['second_description'].'</a><br/>';
					   }
	}
	
для третьей
	function client_page()
	{
                $num = $_GET['SId']
                		echo $num;
	}