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lennym/gist:703272

Forked from avhm/gist:703244
Created November 17, 2010 11:09
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gistfile1.js
$.expr[':'].onscreen = function(obj){
var $win = $(window), pos = $(obj).position();
return $.contains(document.documentElement, obj) && pos.top < $win.height() && pos.left < $win.width();
};
$.expr[':'].offscreen = function(obj){
return !$(obj).is(':onscreen');
};
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