How to check if webpage page is scrolled?

Question

Is there any way in javascript to check if web page has been vertically scrolled? specially for Internet Explorer? I need to get the mouse position in IE but using jQuery event e.pageY it gives correct value when page is not scrolled but when page is scrolled down then it gives wrong position.

Answer 1

In case any future googlers find this, the quick example is:

if(!$(window).scrollTop()) { //abuse 0 == false :)
  alert("You are at the top of this window");
}