How does Google achieve the fading effect on the home page?

Question

If you go to google.com, you notice the menu on top slowly appears once you have mouse over the page. I was wondering what does Google use to control the fading effect?

Answer 1

You could use jQuery and add an onmousemove callback on the tag that fades a hidden div with id "mymenu" in, something like:

$("html").one("mousemove", function() {
 $("#mymenu").fadeIn("slow")
});

Warning: this was typed here, so I dunno if it compiles ootb.