// onScreen jQuery plugin v0.2.1
// (c) 2011 Ben Pickles
//
// http://benpickles.github.com/onScreen
//
// Released under MIT license.
;(function($) {
$.expr[":"].onScreen = function(elem) {
// The viewport position
var $window = $(window);
var viewport_top = $window.scrollTop();
var viewport_height = $window.height();
var viewport_bottom = viewport_top + viewport_height;
// Element position
var $elem = $(elem);
var top = $elem.offset().top;
var height = $elem.height();
var bottom = top + height;
return (top >= viewport_top && bottom + 30 < viewport_bottom);
}
})(jQuery);
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