It was once possible to change the message a browser shows in the status bar at the bottom of the window. This functionality has been disabled in newer browser versions due
There are two things you can do without Flash or Java:
Fake it: display a div
that looks like a status bar.
position: fixed;
bottom: 0;
left: 0;
border: 1px solid silver;
background: #aaaaaa;
Choose URLs so that you show desired information to the user when they hover over links.
But please don't.
Have a look at the pages still changing this info. If it is being done by javascript you should be able to see the source.
Using the browsers statusbar to display page info is in most cases a very bad idea, the browsers has not disabled it without reason.
Instead use somthing like the orange(yellow?) thing stackoverflow have at the top of the page. "Are you new to stackoverflow...", "New posts has been added..." etc etc.