Thanks to all who helped.
The answer...drumroll.... arrays for each entry:
load routine (partial):
print "<td align='center' valign='top'><input type='text'
name='imageqty[]' size='5' value='$qty'></td>";
print "<input type='hidden' name='hiddenalbum[]'
value='".$row[cialbum]."'>";
print "<input type='hidden' name='hiddenset[]'
value='".$row[ciset]."'>";
print "<input type='hidden' name='hiddenimage[]'
value='".$row[ciimage]."'>";
print "<input type='hidden' name='hiddensize[]'
value='".$row[cisize]."'>";
retrieval routine (partial):
$cartid = $_COOKIE['PHPSESSID'];
$imageqty = $_POST['imageqty'];
$qty = $_POST["imageqty"];
$album = $_POST["hiddenalbum"];
$set = $_POST["hiddenset"];
$image = $_POST["hiddenimage"];
$size = $_POST["hiddensize"];
$n = count($qty);
$index = 0;
while($index < $n)
{
$newqty = $qty[$index];
$queryupdate = "update CartItems set ciqty = '$newqty' where ciid =
'$cartid' and cialbum = '$album[$index]' and ciset = '$set[$index]' and
ciimage = '$image[$index]' and cisize = '$size[$index]'";
querythedatabase($queryupdate); // my routine
$index++;
}
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