Images jumbled until page-refresh

[tommybfisher]

I've created a photo gallery with php. The gallery is functioning fine, apart from when an image is uploaded the page displays a couple of the images stacked over one-another. The page is displayed in the correct layout when the page is refreshed. This is happening after each photo upload. I wondered if anyone has come across this problem or if its obvious if there's something in my script that's causing this?

 

<?php
echo "<div class='gallery_row_divide'>";
include "processes/connection.php";
$table = "gallery";
$i = 0;	

$data = mysql_query("SELECT id, name, filetype FROM $table ORDER BY id DESC") or die(mysql_error);

while ($datarow = mysql_fetch_array($data))
{
	$name = $datarow['name'];
	$id = $datarow['id'];
	//determine photo & thumbnail name and location
	if($datarow['filetype'] == "image/png")
		$type = "png";
	else
		$type = "jpg";
	$photo_name = "000". $id;
	$photo_name = substr($photo_name, -4);
	$photo_name = $photo_name. "." .$type;
	$thumbname = "tb_" .$photo_name;
	$thumbname_address = "uploads/thumbs/" .$thumbname;
	$photo_address = "uploads/" .$photo_name;

	//display image
	echo "<div class='gallery_photo_divide'><div class='gallery_photo_valouter'><div class='gallery_photo_valmid'><div class='gallery_photo_valinner'><a href='$photo_address' class='lightbox'><img src='$thumbname_address' alt='photo by $name' class='shadow pic' /></a><br />";
	if(!empty($name))
		echo "<div class='gallery_text_divide'>Photo taken by " .$name. "</div><!--end of .gallery_text_divide-->";
	else
		echo "<div class='gallery_text_divide'> </div><!--end of .gallery_text_divide-->";
	echo "</div><!--end .gallery_photo_valinner--></div><!--end .gallery_photo_valmid--></div><!--end .gallery_photo_valouter--></div><!--end of .gallery_photo_divide-->";
	++$i;
	if($i % 3 == 0)
		echo "</div><!--end of .gallery_row_divide--><div class='gallery_row_divide'>";
}
if(!($i % 3 == 0))
	echo "</div><!--end of .gallery_row_divide-->";
mysql_close($con);
?>

[JKG]

more likely a css issue.