Extension talk:ToggleDisplay

Nice example
I've found a nice use for this extension. You can make a Preview link to view other wiki pages. Here is an example of the code. The code doesn't work on Mediawiki.org because the extension isn't installed here. A working copy can be found here

Main Page  

Another Use
A simple show hide box using this extension, parameters are easy to change to suit your needs, tried and works on version 1.12 and 1.13.5.