!function(e){function r(){o=!1;for(var r=0,t=i.length;r<t;r++){var n=e(i[r]).filter(function(){return e(this).is(":appeared")});if(n.trigger("appear",[n]),p[r]){var a=p[r].not(n);a.trigger("disappear",[a])}p[r]=n}}function t(e){i.push(e),p.push()}var i=[],n=!1,o=!1,a={interval:250,force_process:!1},f=e(window),p=[];e.expr[":"].appeared=function(r){var t=e(r);if(!t.is(":visible"))return!1;var i=f.scrollLeft(),n=f.scrollTop(),o=t.offset(),a=o.left,p=o.top;return p+t.height()>=n&&p-(t.data("appear-top-offset")||0)<=n+f.height()&&a+t.width()>=i&&a-(t.data("appear-left-offset")||0)<=i+f.width()},e.fn.extend({appear:function(i){var f=e.extend({},a,i||{}),p=this.selector||this;if(!n){var u=function(){o||(o=!0,setTimeout(r,f.interval))};e(window).scroll(u).resize(u),n=!0}return f.force_process&&setTimeout(r,f.interval),t(p),e(p)}}),e.extend({force_appear:function(){return!!n&&(r(),!0)}})}(function(){return"undefined"!=typeof module?require("jquery"):jQuery}());