Embeds Flash object slideshow for browsers and creates display of thumbnail with play button and links to gallery for non-Flash (e.g. mobile) devices.
Shortcodes are of the format:
[fshow username=erl_bear photosetid=72157627847553181 thumburl=http://farm7.staticflickr.com/6179/6278299931_fccc887e96_z_d.jpg]
As part of any gallery URL, you should see your username and photosetid. To get the thumburl, choose "View Sizes" and select the 640x480 image. Right-click and choose "Copy Image Location" (or similar) to get the URL.