$target is the page youre opening..
my suggestion would be to change $target to point to a php page, right now its opening up just the picture..
make it open something like
$target = "page.php?image=thumb$jpegs[$picnum]"
then make a new php script page.php, and make it show whatever image was passed - ie
PHP Code:
echo "<img src=\"$image\" border=\"0\">";
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