Allows playing of Last.fm radio stations in a popup window.
(Play In Popup) links/buttons are added next to radio station links and buttons on any page, clicking one of these will play the station in a popup window and also reformat the player page to suit the popup window by removing the header and footer.
While the station is playing, the similar artists and artist information are displayed but the Shoutbox is hidden to avoid a large window.
The window starts off smaller, with a "more >>" link to expand it.
For this expansion to work you may need to allow Javascript to resize windows "Tools > Options > Content > Enable Javascript > Advanced > Move or resize existing windows"

Updates:

10th August - Updated to fix problem with "more >>" and "<< less" links failing if opening page reloaded or closed.