Setting up a simple gallery

[jokesadder]

Hello!
From the title you can tell I am a complete newbie.
I've got a simple blog and I am trying to integrate a gallery. The idea is to display six sample pics on my index page. Clicking on any of them moves the visitor to gallery page. I wrote this but the error reads following:
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource

<?php
$db = mysql_connect("mysql0.someserver.com", "db_user", "db_password");
mysql_select_db("db_name",$db);
$sql = "select * from table_where_I_store_pics order by imageid desc limit 6";
$result = mysql_query($sql ,$db);
                           if 
($myrow = mysql_fetch_array($result)) {

do {
printf("<tr>");
printf("<td align=center><font size=2 face='tahoma'>
<a href=gallery.php><img src=%s></a></font></td>",
 $myrow["thumbpath"]);

printf("</tr>");
                               } 
while ($myrow = mysql_fetch_array($result));
                           }
?>

Good luck all and help me with some hint!
Please do not comment on my printfs. I moved to PHP from another language. I know... I'll soon switch to echo.

[matt72]

That warning means that the query failed and returned a DB error.

Try it with the following to get error info.

$result = mysql_query($sql ,$db) or die(mysql_error());