You need to link to it as http://en.wikipedia.org/wiki/Walled_garden_%28media%29 http://en.wikipedia.org/wiki/Walled_garden_%28media%29 ; those are the hex asc

You need to link to it as http://en.wikipedia.org/wiki/Walled_garden_%28media%29 http://en.wikipedia.org/wiki/Walled_garden_%28media%29 ; those are the hex ascii codes for the parens.