When people click a link to visit my site, I would like to welcome them by displaying a message.

For example, if someone clicks my link on Digg, I want a line of text to appear on my site that says, "Welcome from Digg!" If someone clicks my link on Reddit, I want a line of text to appear on my site that says, "Welcome from Reddit!" If someone doesn't come from one of these sites, I don't want a line of text to appear.

I know this may be an unusual question, but do you know how I can get started? Any info would be great.

Thanks!

<script type="text/javascript">
if  ( document.referrer && document.referrer != "" ) {
      document.write("Hello people from " + document.referrer)
}
</script>

Wow, thanks!