When I click on a thumbnail it opens up a new window with the enlarged image but does not appear to be able to move to the next or previous images.
I note this product is quite old - is it still supported or is there a better product - with similar functionality?

Hello Karen,
In order to be able to loop through different images, make sure to enter the same group name for all of them: prntscr.com/w4itrv

Hi Teodor,

Thanks for getting back to me. The group name has been set see:
sswtest.co.uk/website/testlightbox.html

Sorry but where is the lightbox supposed to be on that page?

Below 'Cheltenham' there are 8 small thumbnails, when I click on any of them I am expecting it to open a lightbox and then to be able to move between the full size images with ' < ' and ' >' type buttons.

The lightbox on this page does not work, due to errors in your code.
The images just open in the browser directly. This is because you have the jquery library included twice on the page, and jquery cannot be included more than once as it causes errors.
Try removing this include from the page:

<script type="text/javascript" src="includes/extendjQuery.js"></script>

OK, I have removed that reference and unfortunately, it still isn't working. Do you have any other suggestions?
sswtest.co.uk/website/testlightbox.html

Now the jquery script is after the lightbox script. Just make sure to move

<script type="text/javascript" src="ScriptLibrary/jquery-latest.pack.js"></script>

before

<script type="text/javascript" src="dmx/widgets/Lightbox/dmx.lightbox.js"></script>

Ok, done, but still not working sorry
sswtest.co.uk/website/testlightbox.html

Ok i see there is one more include at the wrong place.
Just make sure the following includes on the page are in this order:

<script type="text/javascript" src="ScriptLibrary/jquery-latest.pack.js"></script>
<script type="text/javascript" src="dmx/dmx.core.js"></script>
<script type="text/javascript" src="dmx/widgets/Lightbox/dmx.lightbox.js"></script>

Thank you, that seems to be working now, really grateful for your help
sswtest.co.uk/website/testlightbox.html

There is still an issue with the position of the lightbox caused by the reset.css file.: sswtest.co.uk/website/stylesheets/reset.css
Remove the tbody from the first rule of this file:

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	vertical-align: baseline;
}

so it becomes

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	vertical-align: baseline;
}

and this will fix the problem.

Thanks Teodor, I have done this but it still seems to be positioned on the top left of the screen
sswtest.co.uk/website/testlightbox.html

Presumably it should be in the centre.

Better remove the table, thead, td and tr from there as well It's unnecessarily including these.

Thanks for your help Teodor - looks much better now
sswtest.co.uk/website/testlightbox.html