Replace URL with the link, the quotes are required,
and 'target string' with something relevant.
Like, for URL ------- http://www.backpackinglight.com
and for 'target string' -----BPL
It would look like this -
Edit: The examples above are Images, not text. (So you can see the controlling characters.)
Edit: If the URL contains more than the alphabet and numbers, and things don't work, Make a Tiny URL and use that.