ดึงข้อมูลมาแสดง แต่ข้อมูลออกมาไม่หมด เป็นเพราะไรครับ

<?php
  include('config.inc.php');
  $sql="select *from news_tot order by id_news_tot asc";
  $result=mssql_query($sql);
  $num_rows=mssql_num_rows($result);
  $i=0;
while($i<$num_rows)
			{
$rs=mssql_fetch_array($result);
$pic_news=$rs[pic_news];
$head=$rs[head];
$news=$rs[news];

$objOpen = opendir("news");

echo"<div class=txt>";
echo"<div class=floatbox>";
echo "<img src=news/$pic_news width=90 height=80 border=0>";
echo"</div><br><br>";

//echo"<p>";
echo "<a href=\"test3.php?head=$head\"target=\"$head\"><strong>$head</strong></a>";

//echo"</p>";
echo"</div><br><br>";
$i++;
			}
?>

<?
 include('config.inc.php');
  $sql="select *from news_tot where head='$head'";
$result=mssql_query($sql);
 $num_rows=mssql_num_rows($result);
  $i=0;
while($i<$num_rows)
			{
$rs=mssql_fetch_array($result);
$pic_news=$rs[pic_news];
$head=$rs['head'];
$news=$rs['news'];
echo "<div class=box><img src=news/$pic_news width=500 height=375 border=0></div>";
echo"<div class=box><dd>$news</dd></div>";
$i++;
			}
?>