(function($){$.fn.appear=function(fn,options){var settings=$.extend({data:undefined,one:!0,accX:0,accY:0},options);return this.each(function(){var t=$(this);t.appeared=!1;if(!fn){t.trigger('appear',settings.data);return}
    var w=$(window);var check=function(){if(!t.is(':visible')){t.appeared=!1;return}
        var a=w.scrollLeft();var b=w.scrollTop();var o=t.offset();var x=o.left;var y=o.top;var ax=settings.accX;var ay=settings.accY;var th=t.height();var wh=w.height();var tw=t.width();var ww=w.width();if(y+th+ay>=b&&y<=b+wh+ay&&x+tw+ax>=a&&x<=a+ww+ax){if(!t.appeared)t.trigger('appear',settings.data);}else{t.appeared=!1}};var modifiedFn=function(){t.appeared=!0;if(settings.one){w.unbind('scroll',check);var i=$.inArray(check,$.fn.appear.checks);if(i>=0)$.fn.appear.checks.splice(i,1);}
        fn.apply(this,arguments)};if(settings.one)t.one('appear',settings.data,modifiedFn);else t.bind('appear',settings.data,modifiedFn);w.scroll(check);$.fn.appear.checks.push(check);(check)()})};$.extend($.fn.appear,{checks:[],timeout:null,checkAll:function(){var length=$.fn.appear.checks.length;if(length>0)while(length--)($.fn.appear.checks[length])();},run:function(){if($.fn.appear.timeout)clearTimeout($.fn.appear.timeout);$.fn.appear.timeout=setTimeout($.fn.appear.checkAll,20)}});$.each(['append','prepend','after','before','attr','removeAttr','addClass','removeClass','toggleClass','remove','css','show','hide'],function(i,n){var old=$.fn[n];if(old){$.fn[n]=function(){var r=old.apply(this,arguments);$.fn.appear.run();return r}}})})(jQuery)
