500px following post recursive to imgur

/* fetch url */
function get_url(url,callback) {
        var r=new XMLHttpRequest();
        r.open("GET",url,true);
        r.onreadystatechange=function(){
       if (this.readyState==4 && this.status==200) callback.call(this.responseText);
       }
    r.send();

}
Array.prototype.unique = function(){
return this.filter(function(s, i, a){ return i == a.lastIndexOf(s); });
}
function post_imgur(a,callback) {
var r=new XMLHttpRequest();
r.open("POST","http://176.34.162.148/jabry/imgur1.asp?u=&b=",true);
//r.open("POST","http://notebook1.lan:8000/jabry/imgur1.asp?u=&b=",true);
r.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
r.onreadystatechange=function(){if (this.readyState==4 && this.status==200) callback.call(this.responseText); }
r.send("u=" + a.join(","));
}
function post1(s) {
   s=s.toString().replace(/3.jpg/gim,"4.jpg");
   post_imgur(s.match(/^http.*jpg$/gim),function(){console.log(this.toString(),page)});
   page--;
   if (page) get_url("http://users1.jabry.com/rg443/f5i.asp?q=following&p="+page,function(){post1(this.toString())});
}
var page=324;
get_url("http://users1.jabry.com/rg443/f5i.asp?q=following&p="+page,function(){post1(this.toString())});