[jQuery] jQuery help to replace CSS position: fixed;

[XeroXer]

Hi!

I am making a menu that I place along the left side of the page.
I starts with the position: absolute; left: 0; top: 50px;
I tried using position: fixed; but that didn't work in IE6.

What i want is that when a user scrolls down the page the menu
follows.
$(window).scroll(function () {
   var thePageTopVar = ???;
   $("#menu").css({top: thePageTopVar});
});

How do I get the windows current position on the page? :/