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Compatibility issues!!

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I just tested my script on the real server and just realised they use a version of sql that does not support boolean mode searches  is it possible to edit the script below to not use boolean searches? If I remove the 'BOOLEAN MODE' from the script i receive the following message:

'Can't find FULLTEXT index matching the column list '

Any advise on this new problem will be great?

$searchwords = (isset($_GET['words']) ? htmlspecialchars(stripslashes($_REQUEST['words'])) : '');
   echo '<div align="right">';
   echo '<form method="get" action="'.$_SERVER['PHP_SELF'].'">';
   echo '<input type="hidden" name="cmd" value="search" />';
   echo '<input type="text" name="words" value="'.$searchwords.'" /> ';
   echo '<input type="submit" value="Search" class="box" />';
  echo '</form>';
  echo '</div>';

// Create the navigation switch
$cmd = (isset($_GET['cmd']) ? $_GET['cmd'] : '');
     echo '<b>Search Results:<br><br>';
    $searchstring = mysql_escape_string($_GET['words']);
        $sql = "SELECT pd_id, pd_name, pd_more, pd_more2, 
               MATCH(pd_name, pd_more, pd_more2) 
               AGAINST ('$searchstring' IN BOOLEAN MODE) FROM tbl_product
               WHERE MATCH(pd_name, pd_more, pd_more2) 
               AGAINST ('$searchstring' IN BOOLEAN MODE) ORDER BY pd_name DESC";
     $result = mysql_query($sql) or die (mysql_error());
$num_of_rows = mysql_num_rows($result);

if ($num_of_rows > 0)

   while($row = mysql_fetch_assoc($result))
      echo "<a href='categories.php?c=0&p=". $row['pd_id']. "'>".stripslashes(htmlspecialchars($row['pd_name'])).'</a><br />';
echo "<i>No results found, please try another search";


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