Занесение данных в базу данных на хостинге

.........
include("bd.php");
  $sql = mysql_query("SELECT * FROM prise" ,$db);
echo ("<form id='blocka' name='forma' action='save.php' method='post'>");
echo ("<table border ='1'>");
  echo ("<tr bgcolor='#FB8D2D'><td>№</td><td>Товар</td><td>Цена</td><td>Изображение</td></tr>");
  while ($tablerows = mysql_fetch_row($sql))
  {
  echo("<tr><td>$tablerows[0] </td><td><b>$tablerows[1] </b></td><td>  <INPUT TYPE='TEXT' SIZE='10' NAME='cost[$tablerows[0]]' value='$tablerows[2]'></td><td> <INPUT TYPE='TEXT' SIZE='20' NAME='url[$tablerows[0]]' value='$tablerows[3]'></td></tr>");
  }
  echo "</table><br><input name='submit' type='submit' value='Сохранить'></form>";
  mysql_close($db);
.....

<?php
include("bd.php");
 while(list($key,$val) = each($cost) and list($key, $val2) = each($url)) {
  echo "Номер - $key  значение - $val и  $val2<br>\n";
mysql_query("UPDATE prise SET cost='$val', url='$val2' WHERE idtovar='$key'");
}
mysql_close($db);
?>

$sql = mysql_query("SELECT * FROM `prise`" ,$db) or die(mysql_error());
 while ($tablerows = mysql_fetch_row($sq, MYSQL_BOTHl))
{
   echo $tablerows[0]."  ".$tablerows[1]. "  ".$tablerows[2];
}