Làm sao giới hạn số tin trên một trang ???

Em mới làm web nên nhờ người ta thiết kế, em tìm được cái file pho quy định số trang nhưng em kô hiểu làm sao để quy định GIỚI HẠN SỐ TIN TRÊN MỘT TRANG?
Bác nào coi giúp em cái đoạn php ở dưới rùi chỉ em sửa chỗ nào nha
<?php

/*=================================*

|| +++++++++++++++++++++++++++++++ ||

|| + DNT NEWS EXPRESS + ||

|| + ------------------------- + ||

|| + Code by diepnghitinh + ||

|| + phat trien boi xtremedia + ||

|| + Y!m : nguyen2242x@yahoo.com + ||

|| +++++++++++++++++++++++++++++++ ||

*=================================*/



if (!defined('IN_NEWS')) die("<center>thao t&#225;c kh&#244;ng th***7875; th***7921;c hi***7879;n</center>");



//////////////////// ======= VIEW CAT ======= ////////////////////

function view_cat(){

global $db_type,$tpl,$input;



//////////////////// block cat ////////////////////

$file_tpl = 'view_cat';

$main = $tpl->get_main($file_tpl);

$vc['VIEW_CAT'] = $tpl->get_block_from_str($main,'VIEW_CAT',1);

//////////////////// block cat ////////////////////



if(isset($_GET["cat"]))

{

$cat_id = intval($_GET["cat"]);

$counter = intval($_GET["page"]);

if(!empty($counter))

{

$page = $counter;

}

else

{

$page = 1;

}

$limit = page(); //so tin tren 1 trang

$adjacents = 1;

$query = "SELECT COUNT(*) as num FROM ".$db_type."news where categoryidn = ".$cat_id."";

$total_pages = mysql_fetch_array(mysql_query($query));

$total_pages = $total_pages[num];

if($page)

$start = ($page - 1) * $limit;

else

$start = 0;

$query = "SELECT * FROM ".$db_type."news where categoryidn = ".$cat_id." order by newsid desc LIMIT $start, $limit";

$portfolio = mysql_query($query) or die (mysql_error()); //portfolio

if ($page == 0) $page = 1;

$prev = $page - 1;

$next = $page + 1;

$lastpage = ceil($total_pages/$limit);

$lpm1 = $lastpage - 1;

$pagination = "";



if($page <= $lastpage)

{

}

else

{

$error = "<font class='font_loi'><center>ch***432;a c&#243; th&#244;ng tin</center></font>";

return $error;

}





if($lastpage > 1)

{

$pagination .= "<div class="pagination">";

if ($page > 1)

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$prev" class="title" style="text-decoration: none">trang tr***432;***7899;c</a>";

else

$pagination.= "<span class="disabled">trang tr***432;***7899;c</span>";

if ($lastpage < 7 + ($adjacents * 2))

{

for ($counter = 1; $counter <= $lastpage; $counter++)

{

if ($counter == $page)

$pagination.= "<span class="current">$counter</span>";

else

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$counter" class="title" style="text-decoration:none">$counter</a>";

}

}

elseif($lastpage > 5 + ($adjacents * 2))

{

if($page < 1 + ($adjacents * 2))

{

for ($counter = 1; $counter < 2 + ($adjacents*2); $counter++)

{

if ($counter == $page)

$pagination.= "<span class="current">$counter</span>";

else

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$counter" class="title" style="text-decoration: none">$counter</a>";

}

$pagination.= "...";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$lpm1" class="title" style="text-decoration: none">$lpm1</a>";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$lastpage" class="title" style="text-decoration: none">$lastpage</a>";

}

elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2))

{

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=1" class="title" style="text-decoration: none">1</a>";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=2" class="title" style="text-decoration: none">2</a>";

$pagination.= "...";

for ($counter = $page - $adjacents; $counter <= $page + $adjacents; $counter++)

{

if ($counter == $page)

$pagination.= "<span class="current">$counter</span>";

else

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$counter" class="title" style="text-decoration: none">$counter</a>";

}

$pagination.= "...";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$lpm1" class="title" style="text-decoration: none">$lpm1</a>";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$lastpage" class="title" style="text-decoration:none">$lastpage</a>";

}

else

{

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=1" class="title" style="text-decoration: none">1</a>";

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=2" class="title" style="text-decoration: none">2</a>";

$pagination.= "...";

for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)

{

if ($counter == $page)

$pagination.= "<span class="current">$counter</span>";

else

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$counter" class="title" style="text-decoration: none">$counter</a>";

}

}

}

if ($page < $counter - 1)

$pagination.= "<a href="?dnt=/view/&cat=$cat_id&page=$next" class="title" style="text-decoration: none">trang sau</a>";

else

$pagination.= "<span class="disabled">trang sau</span>";

$pagination.= "</div> ";

}



while($item = mysql_fetch_array($portfolio))

{

$row_id = $item[newsid];

$row_id_md5 = md5($row_id);

$row_cat_id = intval($item[categoryidn]);

$row_title = $item[title];

$row_pics = $item[picurl];

$row_mieuta = $item[mieuta];



if (isset($_GET["cat"]))

{

if ($_GET["cat"]=="$row_cat_id")

{

$html .= $tpl->assign_vars($vc['VIEW_CAT'],array('NEWS_ID'=>$row_id,'NEWS_TITLE'=>cut_string ($row_title,70,1),

'MIEU_TA'=>cut_string($row_mieuta,300,1),'LINK_PIC '=>pic("$row_id","$row_id_md5")));

}

}

}

$html .= "<center>".$pagination."</center>";

}

else

{

$error = "<font class='font_loi'>thao t&#225;c kh&#244;ng th***7875; th***7921;c hi***7879;n</font>";

return $error;

}

$html = $tpl->assign_blocks_content($main,array('VIEWCAT'=>$htm l));

return $html;

}

//////////////////// ======= VIEW CAT ======= ////////////////////



?>