On the Webshots site, click to view an album. Copy the first code (“Embed as slideshow in MySpace, your blog or website”). Turn this part:
(That’s the easiest way to do it: actually some of the attributes inside the code are useless, but you needn’t bother with this.)
Paste into HTML post or page editor (or into a text widget for your sidebar). Dimensions can be changed.
Notice, especially if you upload your own photos, that the Webshots slideshow works better with landscape-shaped images.