#1 – In nggfunctions.php

Find the lines that look like:

// remove the element if we didn't start at the beginning
if ($start > 0 ) array_splice($picturelist, 0, $start);

// return the list of images we need
array_splice($picturelist, $maxElement);

Comment them out or delete them. Just below where they are (or were) add:

//Don't modify the array.  We now want to pass all of the picture list
//to the output... but not all are visible as thumbnails.
//TODO:  make a configuration option to select or deselect this
//behavior

foreach ($picturelist as $index => $value)
{
if (($index < $start) || ($index >= ($start + $maxElement)))
  $picturelist[$index]->imageHidden = 1;  //if out of range,
                                          //hide image
else
  $picturelist[$index]->imageHidden = 0;  //otherwise, show it
		}

#2 – in /lib/image.php find the the following about line 18:

var $href = '';		// A href link code

Below it, add:

var $imageHidden = 0;  	// show or not show thumbnail

#3 – lastly, in /view/gallery.php find these lines, starting about line 37:

<!-- Thumbnails -->
<?php foreach ($images as $image) : ?>

<div id="ngg-image-<?php echo $image->pid ?>"
class="ngg-gallery-thumbnail-box">

Delete the <div.. tag. In it’s place, paste this:

<div id="ngg-image-<?php echo $image->pid ?>"
class="ngg-gallery-thumbnail-box"
<?php
  if ( $image->imageHidden == 1 )
  {
    echo " style='display: none' ";
  }
?>
>

Be careful about the closing bracket on the replacement tag!

That should do it.  It’s working on this site anyway!  If you want to make the changes but are afraid of doing so, I’d be happy to email you the necessary files if you say please

You can also follow the discussion on this subject on the WordPress forums here.   Enjoy!

Update 12/29 – another WordPress user reports the mod is working fine with Lightbox as well.

Steve