какая-то хуйня

function Poller(source,target,timeout,prefix,force,suffix){
this.state="";
var caller=this; // да, это костыль
this.poll=function(){
var req=new XMLHttpRequest();
req.open("GET",source+(force?"?"+Math.random():""), true);
req.onreadystatechange=function(){
var r=req;
if (r.readyState==4 && r.status== 200 && (force==1 || caller.state!=r.responseText)){
caller.state=req.responseText;
var fu=(typeof(prefix)=="string"?prefix+r.responseText+(typeof(suffix)=="string"?suffix:""):prefix(source.indexOf(".js")>0?eval("("+r.responseText+")"):r.responseText));
if(target!=null){
document.getElementById(target).innerHTML=fu;
}
}
}
req.send(null);
};
setInterval(this.poll,timeout);
this.poll();
}