error mysql_num_rows()

[sdogos elias <sdogose@yahoo.gr>]

Hi,
i made i search script and in localhost it works ok.
But when i 'll publish the script in the web i see that error msg
 
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/expressfilm.gr/www/demo/results.php on line 51
 
Here is the code of the scripot is (from result.php) 
 
$sindesi=mysql_pconnect("localhost","servers_username","serbers_pass")or die ("no connect");

$basi=mysql_select_db("film") or die("de sindeete");
 
$query="
SELECT `sel` , `body` 
FROM `film`.`main` 
WHERE `sel` 
REGEXP '$key' OR `body` 
REGEXP '$key' LIMIT 0 , 30 

";

$result = mysql_query($query);

  $num = mysql_num_rows($result);
  for ($i=0; $i <$num; $i++)
  {
     $row = mysql_fetch_array($result);
     echo "<p><strong>";
     echo $row["key"];
     echo "</strong><br> ";
  echo' <br>  ';
  $sel =$row["sel"];
  
  echo "<a href = \"index.php?sel=".$sel."\">Περισσότερα</A>";
     echo "</p>";
  }




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