picsarus simple thumbnail grid

var r=new XMLHttpRequest();
r.open("GET","picsarus-ps.txt")
r.onreadystatechange=function(){
   if (this.readyState!=4) return;
   if (this.status!=200) {console.log(this.status,this.statusText);return -1}
   var s=this.responseText;
   var a=[],h={};
   s.match(/(\w+) (\S+)/g).forEach(function(v){
      var x=v.match(/(\w+) (.*)/);
      if(!h.hasOwnProperty(x[2])){
         a.push(x[1]);
         h[x[2]]=x[1];
         }
   });

   window.il=a.join(" ");
   window.page1=~~(a.length/1000)+1;
   var b=il.match(/\w+/g).map(function(v,i){return '<img src="http://127.0.0.1/wp1/www.picsarus.com/'+v+'.jpg?resize=280,280" alt="" width="280" height="280"/>' });
   document.body.insertAdjacentHTML("beforeEnd","<div id=\"data1\">"+ b.slice(0,1000).join("") +"</div>");
   }
r.send();

function show_page(page)  {
   var d=document.getElementById("data1"); if(!d) {d=document.createElement("div");d.id="data1"; document.body.insertAdjacentElement("beforeEnd",d);}
   var pageSize=1000;
   if (!il) return -1;

   var b=il.match(/\w+/g).map(function(v,i){return '<img src="http://127.0.0.'+ ((i%10)+1)+'/wp1/www.picsarus.com/'+v+'.jpg?resize=280,280" alt="" width="280" height="280"/>' });
   d.innerHTML= b.slice((page-1)*pageSize,page*pageSize).join("");

}
var nav1=document.createElement("A");nav1.href="#";nav1.innerText=" Next "; nav1.onclick=function(){if(!page1||page1<1)page1=52; window.stop&&window.stop();show_page(page1--);this.title=page1;return false;};document.body.insertAdjacentElement("afterBegin",nav1);
// show_page(page1);