Thanks for the update.
I did edit the following files to make the slideshow fit the width of my page. These changes were made prior to my noticing the IE9 issue.
1. the index file in the slideshow dissolve folder, commenting out the original script
//$gallery = get_gallery(get_mediarss_url('gallery=' . $pg_id . '&thumb=62c&full=782c'));
$gallery = get_gallery(get_mediarss_url('gallery=' . $pg_id . '&thumb=80c&full=700p'));
2. the properties file inside of admin_gallery/common folders adding these two lines of code to cover either option:
$GLOBALS['resize_proportional'] = array(
array('w' => 700, 'h' => 481, 'watermark' => true)
);
$GLOBALS['resize_cropped'] = array(
array('w' => 700, 'h' => 481, 'watermark' => true)
);
3. plus some changes to the common style sheet for the slideshow dissolve design.
I look forward to what you learn regarding IE9 compatibility.
Thanks,
Robert