Var Window = This

I feel dumb, but yes, I spent a full day wondering why a scrolling "Return To Top" button wasn't working. I had unthinkingly followed the advice of a commentator on Stack Overflow and apparently he was a dick. I spent all day wondering why, when in reality my coe looked like this var window= this; which, inside of a lovely $(document).ready(); meant that when I wrote $(window).scroll(); it was actually $(document).scroll(); which doesn't work in IE8. So we learn two things: I'm an idiot, and IE8 sucks.