BlackBerry - html link to app in App World

You can use client launch link replace 12345 to your app content id.

<a href="http://appworld.blackberry.com/webstore/clientlaunch/12345">My app</a>

All URLs must be in the following format: http://appworld.blackberry.com/webstore/content/XXXX (XXXX = your application ID).

You can find the URL for your application by browsing to your application page on the web store and copying the URL in the browser address bar.

From the FAQ at https://developer.blackberry.com/devzone/blackberryworld/faq.html under

11. BlackBerry World Co-marketing
d. Can I embed a hyperlink to the Get it at BlackBerry World logo?