SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div style="height: 9000px">Content</div>

JavaScript

$(document).mousemove(function(e) {
    console.log(e.pageY - $(window).scrollTop());
});