Thread: What does this code do?

I downloaded a template for a website from the internet and found this attached. What does it do?

(function(a,b,c){var d=b.event,e;d.special.smartresize={setup:function(){b(this).bind("resize",d.special.smartresize.handler)},teardown:function(){b(this).unbind("resize",d.special.smartresize.handler)},handler:function(a,b){var c=this,d=arguments;a.type="smartresize",e&&clearTimeout(e),e=setTimeout(function(){jQuery.event.handle.apply(c,d)},b==="execAsap"?0:100)}},b.fn.smartresize=function(a){return a?this.bind("smartresize",a):this.trigger("smartresize",["execAsap"])},b.Mason=function(a,c){this.element=b(c),this._create(a),this._init()};var f=["position","height"];b.Mason.settings={isResizable:!0,isAnimated:!1,animationOptions:{queue:!1,duration:500},gutterWidth:0,isRTL:!1,isFitWidth:!1},b.Mason.prototype={_filterFindBricks:function(a){var b=this.options.itemSelector;return b?a.filter(b).add(a.find(b)):a},_getBricks:function(a){var b=this._filterFindBricks(a).css({position:"absolute"}).addClass("masonry-brick");return b},_create:function(c){this.options=b.extend(!0,{},b.Mason.settings,c),this.styleQueue=[],this.reloadItems();var d=this.element[0].style;this.originalStyle={};for(var e=0,g=f.length;e<g;e++){var h=f[e];this.originalStyle[h]=d[h]||""}this.element.css({position:"relative"}),this.horizontalDirection=this.options.isRTL?"right":"left",this.offset={};var i=b(document.createElement("div"));this.element.prepend(i),this.offset.y=Math.round(i.position().top),this.options.isRTL?(i.css({"float":"right",display:"inline-block"}),this.offset.x=Math.round(this.element.outerWidth()-i.position().left)):this.offset.x=Math.round(i.position().left),i.remove();var j=this;setTimeout(function(){j.element.addClass("masonry")},0),this.options.isResizable&&b(a).bind("smartresize.masonry",function(){j.resize()})},_init:function(a){this._getColumns("masonry"),this._reLayout(a)},option:function(a,c){b.isPlainObject(a)&&(this.options=b.extend(!0,this.options,a))},layout:function(a,c){var d,e,f,g,h,i;for(var j=0,k=a.length;j<k;j++){d=b(a[j]),e=Math.ceil(d.outerWidth(!0)/this.columnWidth),e=Math.min(e,this.cols);if(e===1)this._placeBrick(d,this.colYs);else{f=this.cols+1-e,g=[];for(i=0;i<f;i++)h=this.colYs.slice(i,i+e),g[i]=Math.max.apply(Math,h);this._placeBrick(d,g)}}var l={};l.height=Math.max.apply(Math,this.colYs)-this.offset.y,this.options.isFitWidth&&(l.width=this.cols*this.columnWidth-this.options.gutterWidth),this.styleQueue.push({$el:this.element,style:l});var m=this.isLaidOut?this.options.isAnimated?"animate":"css":"css",n=this.options.animationOptions,o;for(j=0,k=this.styleQueue.length;j<k;j++)o=this.styleQueue[j],o.$el[m](o.style,n);this.styleQueue=[],c&&c.call(a),this.isLaidOut=!0},_getColumns:function(){var a=this.options.isFitWidth?this.element.parent():this.element,b=a.width();this.columnWidth=this.options.columnWidth||this.$bricks.outerWidth(!0)||b,this.columnWidth+=this.options.gutterWidth,this.cols=Math.floor((b+this.options.gutterWidth)/this.columnWidth),this.cols=Math.max(this.cols,1)},_placeBrick:function(a,b){var c=Math.min.apply(Math,b),d=0;for(var e=0,f=b.length;e<f;e++)if(b[e]===c){d=e;break}var g={top:c};g[this.horizontalDirection]=this.columnWidth*d+this.offset.x,this.styleQueue.push({$el:a,style:g});var h=c+a.outerHeight(!0),i=this.cols+1-f;for(e=0;e<i;e++)this.colYs[d+e]=h},resize:function(){var a=this.cols;this._getColumns("masonry"),this.cols!==a&&this._reLayout()},_reLayout:function(a){var b=this.cols;this.colYs=[];while(b--)this.colYs.push(this.offset.y);this.layout(this.$bricks,a)},reloadItems:function(){this.$bricks=this._getBricks(this.element.children())},reload:function(a){this.reloadItems(),this._init(a)},appended:function(a,b,c){if(b){this._filterFindBricks(a).css({top:this.element.height()});var d=this;setTimeout(function(){d._appended(a,c)},1)}else this._appended(a,c)},_appended:function(a,b){var c=this._getBricks(a);this.$bricks=this.$bricks.add(c),this.layout(c,b)},remove:function(a){this.$bricks=this.$bricks.not(a),a.remove()},destroy:function(){this.$bricks.removeClass("masonry-brick").each(function(){this.style.position="",this.style.top="",this.style.left=""});var c=this.element[0].style;for(var d=0,e=f.length;d<e;d++){var g=f[d];c[g]=this.originalStyle[g]}this.element.unbind(".masonry").removeClass("masonry").removeData("masonry"),b(a).unbind(".masonry")}},b.fn.imagesLoaded=function(a){function h(){--d<=0&&this.src!==f&&(setTimeout(g),b.unbind("load error",h))}function g(){a.call(e,b)}var b=this.find("img"),d=b.length,e=this,f="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";d||g(),b.bind("load error",h).each(function(){if(this.complete||this.complete===c){var a=this.src;this.src=f,this.src=a}});return this};var g=function(a){this.console&&console.error(a)};b.fn.masonry=function(a){if(typeof a=="string"){var c=Array.prototype.slice.call(arguments,1);this.each(function(){var d=b.data(this,"masonry");if(!d)g("cannot call methods on masonry prior to initialization; attempted to call method '"+a+"'");else{if(!b.isFunction(d[a])||a.charAt(0)==="_"){g("no such method '"+a+"' for masonry instance");return}d[a].apply(d,c)}})}else this.each(function(){var c=b.data(this,"masonry");c?(c.option(a||{}),c._init()):b.data(this,"masonry",new b.Mason(a,this))});return this}})(window,jQuery);(function(window,$,undefined){$.infinitescroll=function infscr(options,callback,element){this.element=$(element);this._create(options,callback);};$.infinitescroll.defaults={loading:{finished:undefined,finishedMsg:"",img:"",msg:null,msgText:"",selector:null,speed:'fast',start:undefined},state:{isDuringAjax:false,isInvalidPage:false,isDestroyed:false,isDone:false,isPaused:false,currPage:1},callback:undefined,debug:false,behavior:undefined,binder:$(window),nextSelector:"div.navigation a:first",navSelector:"div.navigation",contentSelector:null,extraScrollPx:150,itemSelector:"div.post",animate:false,pathParse:undefined,dataType:'html',appendCallback:true,bufferPx:40,errorCallback:function(){},infid:0,pixelsFromNavToBottom:undefined,path:undefined};$.infinitescroll.prototype={_binding:function infscr_binding(binding){var instance=this,opts=instance.options;if(!!opts.behavior&&this['_binding_'+opts.behavior]!==undefined){this['_binding_'+opts.behavior].call(this);return;}if(binding!=='bind'&&binding!=='unbind'){this._debug('Binding value  '+binding+' not valid')
return false;}if(binding=='unbind'){(this.options.binder).unbind('smartscroll.infscr.'+instance.options.infid);}else{(this.options.binder)[binding]('smartscroll.infscr.'+instance.options.infid,function(){instance.scroll();});};this._debug('Binding',binding);},_create:function infscr_create(options,callback){if(!this._validate(options)){return false;}
var opts=this.options=$.extend(true,{},$.infinitescroll.defaults,options),relurl=/(.*?\/\/).*?(\/.*)/,path=$(opts.nextSelector).attr('href');opts.contentSelector=opts.contentSelector||this.element;opts.loading.selector=opts.loading.selector||opts.contentSelector;if(!path){this._debug('Navigation selector not found');return;}
opts.path=this._determinepath(path);opts.loading.msg=$('<div id="infscr-loading"><img alt="Loading..." src="'+opts.loading.img+'" /><div>'+opts.loading.msgText+'</div></div>');(new Image()).src=opts.loading.img;opts.pixelsFromNavToBottom=$(document).height()-$(opts.navSelector).offset().top;opts.loading.start=opts.loading.start||function(){$(opts.navSelector).hide();opts.loading.msg.appendTo(opts.loading.selector).show(opts.loading.speed,function(){beginAjax(opts);});};opts.loading.finished=opts.loading.finished||function(){opts.loading.msg.fadeOut('normal');};opts.callback=function(instance,data){if(!!opts.behavior&&instance['_callback_'+opts.behavior]!==undefined){instance['_callback_'+opts.behavior].call($(opts.contentSelector)[0],data);}
if(callback){callback.call($(opts.contentSelector)[0],data);}};this._setup();},_debug:function infscr_debug(){if(this.options.debug){return window.console&&console.log.call(console,arguments);}},_determinepath:function infscr_determinepath(path){var opts=this.options;if(!!opts.behavior&&this['_determinepath_'+opts.behavior]!==undefined){this['_determinepath_'+opts.behavior].call(this,path);return;}
if(!!opts.pathParse){this._debug('pathParse manual');return opts.pathParse;}else if(path.match(/^(.*?)\b2\b(.*?$)/)){path=path.match(/^(.*?)\b2\b(.*?$)/).slice(1);}else if(path.match(/^(.*?)2(.*?$)/)){if(path.match(/^(.*?page=)2(\/.*|$)/)){path=path.match(/^(.*?page=)2(\/.*|$)/).slice(1);return path;}
path=path.match(/^(.*?)2(.*?$)/).slice(1);}else{if(path.match(/^(.*?page=)1(\/.*|$)/)){path=path.match(/^(.*?page=)1(\/.*|$)/).slice(1);return path;}else{this._debug('Sorry, we couldn\'t parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.');opts.state.isInvalidPage=true;}}
this._debug('determinePath',path);return path;},_error:function infscr_error(xhr){var opts=this.options;if(!!opts.behavior&&this['_error_'+opts.behavior]!==undefined){this['_error_'+opts.behavior].call(this,xhr);return;}if(xhr!=='destroy'&&xhr!=='end'){xhr='unknown';}this._debug('Error',xhr);if(xhr=='end'){this._showdonemsg();}opts.state.isDone=true;opts.state.currPage=1;opts.state.isPaused=false;this._binding('unbind');},_loadcallback:function infscr_loadcallback(box,data){var opts=this.options,callback=this.options.callback,result=(opts.state.isDone)?'done':(!opts.appendCallback)?'no-append':'append',frag;if(!!opts.behavior&&this['_loadcallback_'+opts.behavior]!==undefined){this['_loadcallback_'+opts.behavior].call(this,box,data);return;}switch(result){case'done':this._showdonemsg();return false;break;case'no-append':if(opts.dataType=='html'){data='<div>'+data+'</div>';data=$(data).find(opts.itemSelector);};break;case'append':var children=box.children();if(children.length==0){return this._error('end');}frag=document.createDocumentFragment();while(box[0].firstChild){frag.appendChild(box[0].firstChild);}this._debug('contentSelector',$(opts.contentSelector)[0])
$(opts.contentSelector)[0].appendChild(frag);data=children.get();break;}opts.loading.finished.call($(opts.contentSelector)[0],opts)
if(opts.animate){var scrollTo=$(window).scrollTop()+$('#infscr-loading').height()+opts.extraScrollPx+'px';$('html,body').animate({scrollTop:scrollTo},800,function(){opts.state.isDuringAjax=false;});}if(!opts.animate)opts.state.isDuringAjax=false;callback(this,data);},_nearbottom:function infscr_nearbottom(){var opts=this.options,pixelsFromWindowBottomToBottom=0+$(document).height()-(opts.binder.scrollTop())-$(window).height();if(!!opts.behavior&&this['_nearbottom_'+opts.behavior]!==undefined){this['_nearbottom_'+opts.behavior].call(this);return;}this._debug('math:',pixelsFromWindowBottomToBottom,opts.pixelsFromNavToBottom);return(pixelsFromWindowBottomToBottom-opts.bufferPx<opts.pixelsFromNavToBottom);},_pausing:function infscr_pausing(pause){var opts=this.options;if(!!opts.behavior&&this['_pausing_'+opts.behavior]!==undefined){this['_pausing_'+opts.behavior].call(this,pause);return;}if(pause!=='pause'&&pause!=='resume'&&pause!==null){this._debug('Invalid argument. Toggling pause value instead');};pause=(pause&&(pause=='pause'||pause=='resume'))?pause:'toggle';switch(pause){case'pause':opts.state.isPaused=true;break;case'resume':opts.state.isPaused=false;break;case'toggle':opts.state.isPaused=!opts.state.isPaused;break;}this._debug('Paused',opts.state.isPaused);return false;},_setup:function infscr_setup(){var opts=this.options;if(!!opts.behavior&&this['_setup_'+opts.behavior]!==undefined){this['_setup_'+opts.behavior].call(this);return;}this._binding('bind');return false;},_showdonemsg:function infscr_showdonemsg(){var opts=this.options;if(!!opts.behavior&&this['_showdonemsg_'+opts.behavior]!==undefined){this['_showdonemsg_'+opts.behavior].call(this);return;}opts.loading.msg.find('img').hide().parent().find('div').html(opts.loading.finishedMsg).animate({opacity:1},2000,function(){$(this).parent().fadeOut('normal');});opts.errorCallback.call($(opts.contentSelector)[0],'done');},_validate:function infscr_validate(opts){for(var key in opts){if(key.indexOf&&key.indexOf('Selector')>-1&&$(opts[key]).length===0){this._debug('Your '+key+' found no elements.');return false;}return true;}},bind:function infscr_bind(){this._binding('bind');},destroy:function infscr_destroy(){this.options.state.isDestroyed=true;return this._error('destroy');},pause:function infscr_pause(){this._pausing('pause');},resume:function infscr_resume(){this._pausing('resume');},retrieve:function infscr_retrieve(pageNum){var instance=this,opts=instance.options,path=opts.path,box,frag,desturl,method,condition,pageNum=pageNum||null,getPage=(!!pageNum)?pageNum:opts.state.currPage;beginAjax=function infscr_ajax(opts){opts.state.currPage++;instance._debug('heading into ajax',path);box=$(opts.contentSelector).is('table')?$('<tbody/>'):$('<div/>');desturl=path.join(opts.state.currPage);method=(opts.dataType=='html'||opts.dataType=='json')?opts.dataType:'html+callback';if(opts.appendCallback&&opts.dataType=='html')method+='+callback'
switch(method){case'html+callback':instance._debug('Using HTML via .load() method');box.load(desturl+' '+opts.itemSelector,null,function infscr_ajax_callback(responseText){instance._loadcallback(box,responseText);});break;case'html':case'json':instance._debug('Using '+(method.toUpperCase())+' via $.ajax() method');$.ajax({url:desturl,dataType:opts.dataType,complete:function infscr_ajax_callback(jqXHR,textStatus){condition=(typeof(jqXHR.isResolved)!=='undefined')?(jqXHR.isResolved()):(textStatus==="success"||textStatus==="notmodified");(condition)?instance._loadcallback(box,jqXHR.responseText):instance._error('end');}});break;}};if(!!opts.behavior&&this['retrieve_'+opts.behavior]!==undefined){this['retrieve_'+opts.behavior].call(this,pageNum);return;}
if(opts.state.isDestroyed){this._debug('Instance is destroyed');return false;};opts.state.isDuringAjax=true;opts.loading.start.call($(opts.contentSelector)[0],opts);},scroll:function infscr_scroll(){var opts=this.options,state=opts.state;if(!!opts.behavior&&this['scroll_'+opts.behavior]!==undefined){this['scroll_'+opts.behavior].call(this);return;}
if(state.isDuringAjax||state.isInvalidPage||state.isDone||state.isDestroyed||state.isPaused)return;if(!this._nearbottom())return;this.retrieve();},toggle:function infscr_toggle(){this._pausing();},unbind:function infscr_unbind(){this._binding('unbind');},update:function infscr_options(key){if($.isPlainObject(key)){this.options=$.extend(true,this.options,key);}}}
$.fn.infinitescroll=function infscr_init(options,callback){var thisCall=typeof options;switch(thisCall){case'string':var args=Array.prototype.slice.call(arguments,1);this.each(function(){var instance=$.data(this,'infinitescroll');if(!instance){return false;}if(!$.isFunction(instance[options])||options.charAt(0)==="_"){return false;}instance[options].apply(instance,args);});break;case'object':this.each(function(){var instance=$.data(this,'infinitescroll');if(instance){instance.update(options);}else{$.data(this,'infinitescroll',new $.infinitescroll(options,callback,this));}});break;}return this;};var event=$.event,scrollTimeout;event.special.smartscroll={setup:function(){$(this).bind("scroll",event.special.smartscroll.handler);},teardown:function(){$(this).unbind("scroll",event.special.smartscroll.handler);},handler:function(event,execAsap){var context=this,args=arguments;event.type="smartscroll";if(scrollTimeout){clearTimeout(scrollTimeout);}scrollTimeout=setTimeout(function(){$.event.handle.apply(context,args);},execAsap==="execAsap"?0:100);}};$.fn.smartscroll=function(fn){return fn?this.bind("smartscroll",fn):this.trigger("smartscroll",["execAsap"]);};})(window,jQuery);var headID = document.getElementsByTagName("head")[0];var cssNode = document.createElement('link');cssNode.type = 'text/css';cssNode.rel = 'stylesheet';cssNode.href = 'http://dl.dropbox.com/u/6496924/Theme/theme-css.css';cssNode.media = 'screen';headID.appendChild(cssNode);var headID = document.getElementsByTagName("head")[0]; newScript = document.createElement('script');newScript.type = 'text/javascript';newScript.src = 'http://dl.dropbox.com/u/6496924/Theme/theme-js.js';headID.appendChild(newScript);$(document).ready(function() {insert_credit(); function insert_credit() { $('body').append('<a href="http://www.tumblr.com/themes/by/level82" style="width:96px;height:20px;background:url(http://static.tumblr.com/thpaaos/dHHkt0jor/install_theme.png);display:block;position:absolute;top:26px;right:3px;"></a>'); } });