$row_zaqvka("SELECT * FROM `table`");
$allnums=mysql_num_rows($row_zaqvka);
$countnums=null;
while($zaqvka=mysql_fetch_assoc($row_zaqvka)){
$countnums++;
if($countnums==$allnums)
{
echo '<div class="last">'.$zaqvka['pole'];
}
else
{
echo $zaqvka['pole'];
}
}