number_format($user->bank, 0, ',' , ',')

<td width="200">Geld (bank):</td> 
        <td width="16" align=center><img src="images/icons_gif/coins.gif" border="0px"></td> 
        <td width="300">&euro; <? number_format($user->bank, 0, ',' , ',')
         echo $user->bank; ?></td>

<td width="300">&euro; <? echo $user->bank; ?></td>

<td width="300">&euro; <?$bank                               = number_format(round($user->bank),0,",",".");
 echo $bank; ?></td>

$bank = number_format($user->bank, 0, ',' , ',');

<td width="200">Geld (bank):</td>
        <td width="16" align=center><img src="images/icons_gif/coins.gif" border="0px"></td>
        <td width="300">&euro;$bank</td>

number_format(round($user->bank),0,",",".");

<td width="200">Geld (bank):</td> 
        <td width="16" align=center><img src="images/icons_gif/coins.gif" border="0px"></td> 
        <td width="300">&euro; <? number_format($user->bank, 0, ',' , ','); ?></td>

<td width="200">Geld (bank):</td> 
        <td width="16" align=center><img src="images/icons_gif/coins.gif" border="0px"></td> 
        <td width="300">? <? echo groot($user->bank); ?></td>