problem js ajax Opcje

[rychu123]

witam, mam problem z tym skryptem tzn nie działa a ajaxa to ja nie umie ;/

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function createRreg(){
	var reg = null;
	if(window.XMLHttpRequest){
		reg = new XHMLttpRequest();
	}else{
		req = new ActiveXObject("Microsoft.XHLMTTP");
	}
	return req;
}
 
function doSubmit(){
	var req = careateReq();
	if(reg == null){
	alert('brak');
	return;
	}
	var url = "s.php";
	req.open("GET", url, true);
	req.onreadystatechange = function(){
		if(req.readyState ==4 &&  req.status==200){
 
		document.getElementById('tt')= innerHTML = req.responseText;
		}
	}
	req.send(null);
}
window.onload = function(){
 
	doSubmit();
}
[PHP] pobierz, plaintext