There are a lot of fine Lightboxes on the market, both free and commercials, but they all need to be installed into Your Confluence:
First, All of the stuff below is quite generic and samples only
Second, all the files are considered "foreign" during an upgrade and must be reimplemented.
Under Confluence
Download the lightbox zip, upload it to the server and place the files under the install:
cd /opt/confluence/confluence mkdir mylightbox cd mylightbox mv ~/mylightbox.zip . unzip mylightbox.zip
Somewhere else in the filesystem
Download the lightbox zip, upload it to the server and place the files under the install:
This requires support for Linking in Tomcat
cd /data mkdir mylightbox cd mylightbox mv ~/mylightbox.zip . unzip mylightbox.zip ln -s /data/mylightbox /opt/confluence/confluence/mylightbox
The Common Part
Now these can be referenced as /opt/confluence/confluence id the server root, so in Custom HTML add:
<!-- MyLignbox --> <link rel="stylesheet" href="/mylightbox/css/mylightbox.css" type="text/css" media="screen" charset="utf-8" /> <script src="/mylightbox/js/jquery.mylightbox.js" type="text/javascript" charset="utf-8"></script>
Some lighboxes requires to be initiated ($ is AJS.$ for Confluence):
<script type="text/javascript" charset="utf-8">
AJS.$(document).ready(function(){
AjS.$("a[rel^='mylightbox']").mylightbox();
});
</script>
Confluence page based