HTTP_REFERER is set by the client, so it may produce strange results( 127.0.0.1 or www.nsa.gov for instance ;). not that mucking around with the url won't produce strange results.

if you set some user session data to lasnode_id, what happens when a user opens links in new windows? you still need to figure out which "window", or node, the user came from.

saving each node_id / lastnode_id pair generated can grow really big really quick, seeing how there are almost 13000 nodes( i think ).

while i agree with chip's statement about urls not morphing, i don't see any simple, reliable alternatives. besides, any statistics gathered from site usage should alot for bookmarks and such.

Will perl for money
JJ Knitis
(901) 756-7693
gt8073a@industrialmusic.com