work.js

function xhrStart(method,url,data,requestHeader,callback){
	var xhr = new XMLHttpRequest();
	xhr.onload = function(){
		callback(xhr.response);
	}
	xhr.open(method,url);
	if(requestHeader !== null)
		for(key in requestHeader)
			xhr.setRequestHeader(key,requestHeader[key]);
	xhr.responseType = "document";
	xhr.send(data);
}
var workFinish = function(document){
	var n = Number(document.getElementsByClassName('status_numeric x-small')[0].innerHTML.slice(0,-3));
	if(n >= 2)
		workStart();
}
var workStart = function(){
	xhrStart('GET','http://uni.priget.com/s/app/income/income_exec.php',null,null,workFinish);
}

workStart();