PHP - help

Here's a working version - When I got yours to work the resizing of images didn't appear to work either :/

showgallery.php

<?php

$fCount = 0;



if ($handle = opendir('bignails')) {
    while (false !== ($file = readdir($handle))) { 
        if ($file != "." && $file != "..") {
	        if (substr($file, strlen($file)-3, 3)=="jpg" ) {
	            $fCount=$fCount+1;
				$fName[] = $file;
	        }            
        }
    }
}
closedir($handle);

?>

<br/>

<?php echo "Images in gallery: ",$fCount; ?>

<table cellspacing = "2">

	<?php for($i=0; $i<=$fCount-1; $i++){
	$Name=$fName[$i];
	?>
	<?php echo $Name; ?> 
	<td>
		<tr>
		<a href="bignails/<?php echo $Name; ?>">
		<img src="tn_gen/thumb.php?<?php echo $Name; ?>">
		</a>
		</tr>
	</td>
	<?php } ?>
	
</table>

thumb.php

<?php
header("Content-Type: image/jpeg");

$image_file = str_replace('..', '', $_SERVER['QUERY_STRING']);
$image_path = "../bignails/$image_file";

function createthumb($src_image,$new_w,$new_h)
{
	$src_img=imagecreatefromjpeg($src_image);
	$old_x=imageSX($src_img);
	$old_y=imageSY($src_img);
	if ($old_x > $old_y) 
	{
		$thumb_w=$new_w;
		$thumb_h=$old_y*($new_h/$old_x);
	}
	if ($old_x < $old_y) 
	{
		$thumb_w=$old_x*($new_w/$old_y);
		$thumb_h=$new_h;
	}
	if ($old_x == $old_y) 
	{
		$thumb_w=$new_w;
		$thumb_h=$new_h;
	}
	$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
	imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
	imagejpeg($dst_img); 
	imagedestroy($dst_img); 
	imagedestroy($src_img); 
}

# Display the image
createthumb($image_path,80,80);
?>