function show_signin()  { 
	if (xmlHttp.readyState==4) { 
		document.getElementById("signin").innerHTML=xmlHttp.responseText;
	}
}

function signin() {
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null){
		alert ("Your browser does not support AJAX!");
		return;
	}
	
	var url="data/signin.php?s=signin";
	xmlHttp.onreadystatechange=show_signin;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}