I have a need for some conditional code to be displayed to site visitors coming from a specific referrer. I am already using something similar on my personal site for people using Internet Explorer. If you visit my site with IE, you will notice the blurb at the top of the page advertising Firefox. If you are not using IE, then good for you, you won't see the nag message.

What I want to do is display a message top people who have popped in from specific referrers. Like a message for people that came in from Google, BlogExplosion, etc. But I do not want the message to come up for anyone else.

Does anyone know how to set up such bloggery goodness? I'm Googling it now as we speak, but help a buddy out, will ya?

Thanks!