a jquery method to get the position of an object relative to the viewport (doesn't work that well sometimes, because of merged margins and such)

gistfile1.js

(function($) {
  $.fn.viewportPosition = function() {
    var a = this, b = a.offset().top - $(window).scrollTop(), c = a.offset().left - $(window).scrollLeft();
    return {top: b, left: c};
  };
})(jQuery);