Image Gallery Summary View

I did have the file in place, even tried adding it to the subdirectory which corresponded to a variation of the theme I am using. Still same problem and error message.
I haven't yet un-commented and edited the following section of code for insertion in template.php:
/** - In your template.php file, add the following code to override the
* summary method for YOUR_VIEW (substitute your view name):
*
*function phptemplate_views_summary_galleries_by_user2($view, $type, $level, $nodes, $args) {
*drupal_add_css(drupal_get_path('theme', 'YOUR THEME') .'image_gallery.css', 'theme');
* return theme_summary_view_image_gallery($view, $type, $level, $nodes, $args);
* }
other than replacing the YOUR_VIEW bits with the gallery name as it appears on the left in the Administer views page as above I'm not sure what else I might need to do to this bit of code - it looks like I might need to select a .css template to replace the YOUR THEME bit...
Could the fact that this section remains incomplete and commented out be causing the above problem?

So for some reason node_changed was not available in my $result array, so I ended up using node_created_created which works fine for me.

I've modified the code to sort by date by creating

$sortby=array()

before

foreach ($nodes as $query) {

and then replacing the end of the loop (I've kept the first line the same so that you can easily reference where to insert this) with the following code:

$linkText = $imgTag .' '. $title;
// Create an array with the created date as keys and the themed output as values
$content2 = _theme_gallery_summary($imgTag, $url, $title, $query->num_nodes, $modDate, $description);
$sortdate[$modDate] = $content2;
// sort by date, newest to oldest
krsort($sortdate);
}
foreach ($sortdate as $value) {
$content .= $value;
}

Hopefully this is helpful to someone! One final question to bounce off of you - this code limits the number of summary galleries to the number of images I have set to display per page in my view. For example, I have set in my view to display 12 photos per page with a pager; consequently, only the 12 most recent albums show on my summary album page - there is no pager on this page.

I thought that I might could fix this by changing the false to true in

$result = views_build_view('items', $view, array($arg), false, 1);

but this only messed things up. Any ideas how I could add a pager so that my summary album page will show all of my albums?

Thanks again for your help!