var imagesrcname='a',thissrolltop=500,imageurlarray=new Array();imageurlarray[0]='http://malayou.com';imageurlarray[1]='http://malayou.com';imageurlarray[2]='http://malayou.com';imageurlarray[3]='http://malayou.com';imageurlarray[4]='http://malayou.com';lazyLoad=(function(){var map_element={};var element_obj=[];var download_count=0;var last_offset=-1;var doc_body;var doc_element;var lazy_load_tag;function initVar(tags){doc_body=document.body;doc_element=document.compatMode=='BackCompat'?doc_body:document.documentElement;lazy_load_tag=tags||["img","iframe"]};function initElementMap(){for(var i=0,len=lazy_load_tag.length;i<len;i++){var el=document.getElementsByTagName(lazy_load_tag[i]);for(var j=0,len2=el.length;j<len2;j++){if(typeof(el[j])=="object"&&el[j].getAttribute(imagesrcname)){element_obj.push(el[j])}}}for(var i=0,len=element_obj.length;i<len;i++){var o_img=element_obj[i];var t_index=getAbsoluteTop(o_img);if(map_element[t_index]){map_element[t_index].push(i)}else{var t_array=[];t_array[0]=i;map_element[t_index]=t_array;download_count++}}};function initDownloadListen(){if(!download_count)return;var getscrolltop=document.body.scrollTop;if(getscrolltop==0){getscrolltop=document.documentElement.scrollTop}var offset=(window.MessageEvent&&!document.getBoxObjectFor)?getscrolltop:getscrolltop;var visio_offset=offset+doc_element.clientHeight;if(last_offset==visio_offset){setTimeout(initDownloadListen,200);return}last_offset=visio_offset;var visio_height=doc_element.clientHeight+thissrolltop;var img_show_height=visio_height+offset;var allurlnum=parseInt(imageurlarray.length);if(allurlnum<=0){allurlnum=1}var j=0;for(var key in map_element){if(img_show_height>key){var t_o=map_element[key];var img_vl=t_o.length;for(var l=0;l<img_vl;l++){var u_j=j%allurlnum;var thisurl=imageurlarray[u_j];element_obj[t_o[l]].src=thisurl+element_obj[t_o[l]].getAttribute(imagesrcname);j++}delete map_element[key];download_count--}}setTimeout(initDownloadListen,200)};function getAbsoluteTop(element){if(arguments.length!=1||element==null){return null}var offsetTop=element.offsetTop;while(element=element.offsetParent){offsetTop+=element.offsetTop}return offsetTop}function init(tags){initVar(tags);initElementMap();initDownloadListen()};return{init:init}})();lazyLoad.init();