Trigger JQuery function when passed half way down the page

Question

Is there a way to tell if you have scrolled passed the center of the web page or in other words, when you have scrolled passed exactly half of the web page and your scrollba

Answer 1

you can use the focus event if you scroll down to it (just like jQuery uses for their comments)

jQuery('selector').focus(function() {
  jQuery('.page').show();
});