[NextGen Gallery] Customize random display

Hi everybody,

I would like to display 7 random images of all galleries on a site. I’m using this code:

[random max=7]

That works fine. But how can I customize the displaying on my site? It creates this output:

<div class="ngg-galleryoverview" id="ngg-gallery--###">

	<!-- Thumbnails -->

	<div id="ngg-image-801" class="ngg-gallery-thumbnail-box">

		<div class="ngg-gallery-thumbnail" >
			<a href="https://###.jpg" title=" ">
				<img title="###" alt="###" src="https://###.jpg" width="##" height="##" />
			</a>
		</div>
	</div>

	...            		

</div>

But I don’t like this output. I like to customize it. I tried to edit the files stored at wp-content\plugins\nextgen-gallery\view but nothing changed. Does anybody has an idea where I can change the output of the random feature?

Thank you!

Raisis