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