Warning: mysql_num_rows

[Psyk0]

<?php
 
$query = "SELECT * FROM progetti ORDER by id DESC";
$result = mysql_query($query);
 
if(mysql_num_rows($result)==0){
echo "<tr><td>Nessun progetto inserito</td></tr>";
 
}else{
 
$i=0;
 
while ($row = mysql_fetch_array($result)){
 
$query2 = "SELECT * FROM foto WHERE progid = '$row[id]'"; 
$result2 = mysql_query($query2);
 
$numfoto = mysql_num_rows($result2);
 
   if ($i % 2 ==0) {
     $color ="#CCCCCC"; 
   }
 
   else{ 
     $color = "#FFFFFF";
    }
 
echo "<tr bgcolor='".$color."'>
        <td align='center' valign='center'>
         [url='index.php?mode=prog&progid=".$row[']".$row['nome']."[/url]
       </td>
 
 
 
<td height='20' align='center'>".$numfoto."</td>
<td height='20'>".$row['descrizione']."</td>
<td height='20'>".$row['categoria']."</td>
<td width='4%' align='center' ><a href='index.php?mode=edit&id=".$row['id']."'[img]img/edit.gif[/img]</a></td>
<td height='20' align='center'><input type='checkbox' name='caselle[]' value='".$row['id']."' /></td>
</tr>";
 
$i++;
 
     }
}
?>

prova cosi...