XWiki: show / hide DIV

{{velocity}}
{{html}}
<div id="DIV ID" class="">
This Box will be hidden if you click on the box below!
</div>

<div onclick="toggleClass($('DIV ID'), 'hidden')">
Show/Hide the box!
</div>

Or alternatively the following one to keep the box hidden when page loads:

<div id="DIV ID" class="hidden">
This Box will be hidden if you click on the box below !
</div>

<div onclick="toggleClass($('DIV ID'), 'hidden')">
Show/Hide the box!
</div>
{{/html}}
{{/velocity}}

Source: https://snippets.xwiki.org/xwiki/bin/view/Extension/Show%20Hide%20DIV