[thelist] popup splash without being intrusive and annoying!

[Andrew]

I want to provide visitors with a promotional offer without it being
permanent and once displayed or closed thats it the session is killed.

Some views on this would be nice before proceeding.  I am thinking about
just making a link more visible than anything else but the reason for not
doing this is I don't want to amend the rest of the design of the site

thank you
Andrew