(function(n){n.fn.unveil=function(t,i){function o(){var t=u.filter(function(){var t=n(this);if(!t.is(":hidden")){var i=r.scrollTop(),e=i+r.height(),u=t.offset().top,o=u+t.height();return o>=i-f&&u<=e+f}});e=t.trigger("unveil");u=u.not(e)}var r=n(window),f=t||0,s=window.devicePixelRatio>1,h=s?"data-src-retina":"data-src",u=this,e;this.one("unveil",function(){var n=this.getAttribute(h);n=n||this.getAttribute("data-src");n&&(this.setAttribute("src",n),typeof i=="function"&&i.call(this))});r.on("scroll.unveil resize.unveil lookup.unveil",o);return o(),this}})(window.jQuery||window.Zepto)