var xhr = new XMLHttpRequest(),
xhr2 = new XMLHttpRequest()
xhr.open("POST", "LINK", 1);
xhr.send('DATA');
xhr2.open("POST", "LINK", 1);
xhr2.send('DATA');
xhr.timeout = 220;
xhr2.timeout = 220;
XMLHttpRequest.ontimeout = timeoutRaised;
function timeoutRaised()
{
alert("PASSOU DO TEMPO");
}

var xhr = new XMLHttpRequest(),
xhr.open("POST", "LINK", 1);
xhr.send('DATA');
xhr.send('DATA');