"

From 2013.igem.org

(function(c){function p(){var d,a={height:h.innerHeight,width:h.innerWidth};if(!a.height&&((d=i.compatMode)||!c.support.boxModel))d=d==="CSS1Compat"?k:i.body,a={height:d.clientHeight,width:d.clientWidth};return a}var m={},e,a,i=document,h=window,k=i.documentElement,j=c.expando;c.event.special.inview={add:function(a){m[a.guid+"-"+this[j]]={data:a,$element:c(this)}},remove:function(a){try{delete m[a.guid+"-"+this[j]]}catch(c){}}};c(h).bind("scroll resize",function(){e=a=null});setInterval(function(){var d= c(),j,l=0;c.each(m,function(a,b){var c=b.data.selector,e=b.$element;d=d.add(c?e.find(c):e)});if(j=d.length){e=e||p();for(a=a||{top:h.pageYOffset||k.scrollTop||i.body.scrollTop,left:h.pageXOffset||k.scrollLeft||i.body.scrollLeft};l<j;l++)if(c.contains(k,d[l])){var g=c(d[l]),f={height:g.height(),width:g.width()},b=g.offset(),n=g.data("inview"),o;if(!a||!e)break;b.top+f.height>a.top&&b.top<a.top+e.height&&b.left+f.width>a.left&&b.left<a.left+e.width?(o=a.left>b.left?"right":a.left+e.widthb.top?"bottom":a.top+e.height<b.top+f.height?"top":"both",b=o+"-"+f,(!n||n!==b)&&g.data("inview",b).trigger("inview",[!0,o,f])):n&&g.data("inview",!1).trigger("inview",[!1])}}},250)})(jQuery);