With a iframe you can easily access flickr with a dynamic slideshow. Thereby, only specific tags can be used as filters to access only specific photos. Have fun!

<iframe
src=http://www.flickr.com/slideShow/
index.gne?user_id=(userID)
&tags=berlin

align=center
frameBorder=0
width=300
scrolling=no
height=300>
</iframe>

Just replace userID with yours and add your tag or leave it. The full list of attributes available for this service can be seen at www.flickr.com/services/api/