Issue Looping through database items using for and while

[HDFilmMaker2112]

I'm having a bit of an issue with the below:

 

for($i=1; $i <= 3; $i++){
$credits_query="SELECT * FROM $tbl_name4 WHERE film_number='$i'";
$credits_result=mysql_query($credits_query);
$content.='
<div class="credit_header">';
if($i==1){$content.='First';}elseif($i==2){$content.='Second';}elseif($i==3){$content.='Third';} 
$content.=' Film Crew/Producer Credits
</div>
<table class="producer_table">
<tr class="producer_background">
<td class="border sixty">
Crew or Producer Position
</td>
<td class="border  twenty">
Amount
</td>
<td class="border">
Buy
</td>
</tr>
</table>
<div class="producer_scroll">
<table class="producer_table">';
while($credits_row=mysql_fetch_row($credits_result)){
extract($credits_row);
$content.='
<tr align="center">
<td class="border sixty">'
.$position.
'</td>
<td class="border twenty">$'
.$cost.
'</td>
<td class="border">
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="'.$product_code.'">QMNXL6WXL4YL6
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_buynow_SM.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
</td>
</tr>';
}
$content.='
</table>
</div>';
}

 

I'm trying to make it loop three times, once for each film. Under each generated table it will be filled in with the credits available for purchase for that specific film, with that data being pulled from the database. Currently, it's not generating the tables with the database data:

 

It just does this:

<div class="producer_scroll">
<table class="producer_table">
</table>
</div>

 

 

<div class="credit_header">First Film Crew/Producer Credits
</div>
<table class="producer_table">
<tr class="producer_background">
<td class="border sixty">
Crew or Producer Position

</td>
<td class="border  twenty">
Amount
</td>
<td class="border">
Buy
</td>
</tr>
</table>
<div class="producer_scroll">
<table class="producer_table">
</table>
</div>
<div class="credit_header">Second Film Crew/Producer Credits
</div>
<table class="producer_table">
<tr class="producer_background">

<td class="border sixty">
Crew or Producer Position
</td>
<td class="border  twenty">
Amount
</td>
<td class="border">
Buy
</td>
</tr>
</table>
<div class="producer_scroll">
<table class="producer_table">
</table>
</div>
<div class="credit_header">Third Film Crew/Producer Credits
</div>

<table class="producer_table">
<tr class="producer_background">
<td class="border sixty">
Crew or Producer Position
</td>
<td class="border  twenty">
Amount
</td>
<td class="border">
Buy
</td>
</tr>
</table>
<div class="producer_scroll">
<table class="producer_table">
</table>
</div>

[HDFilmMaker2112]

Forgot to mention it also gives this error:

 

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in /home/zyquo/public_html/makethemoviehappen.com/main.php on line 347

 

Line 347 -> while($credits_row=mysql_fetch_array($credits_result)){

 

EDIT: I didn't set the $tbl_name4 variable. All my problems are so simple...