well one way you could do for simplicity is using an iframe
some people don't like them much but they work well for this type of thing
an example would be
Code:
<iframe align="center" src="http://www.flickr.com/slideShow/index.gne?user_id=<<your flickrID>>&tags=<<YOUR-TAGS>>" frameBorder="0" "width=500" height="500" scrolling="no"></iframe>
place in an html page would show your slideshow (or the user ID you used) and the pics with the tags you select
You'll have to replace <<your flickrID>> with your own.
If you don't know what yours is,
idGettr will tell you.
Replace <<YOUR-TAGS>> with whatever tags you want in the slideshow. If you want to show a photoset instead of photos with a particular tag, replace tags=YOUR_TAG with photoset_id=PHOTOSET_ID, where photoset_ID is the string of numbers at the end of a photoset URL, e.g. the 1234567 in flickr.com/photos/username/sets/1234567/. There's a variety of other parameters you can use, including:
* contacts=
* text=
* tag_mode=
* favorites=
* group_id=
* frifam=
* nsid=
* single=
* firstIndex=
* set_id=
* firstId=
Have a play to figure out what they do. Just make sure you have an & between each parameter.
If all that seems like rubbish, try using the tool at
http://flickrslidr.com/ it pretty much builds the code above for you
or a slightly more polished version here
http://www.db798.com/pictobrowser/builder.php