function createHttpRequest() {
var httpRequest;
var browser = navigator.appName;
if (browser == "Microsoft Internet Explorer") {
httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
} else {
httpRequest = new XMLHttpRequest();
}
return httpRequest;
}

function sendRequest(file, _resultId, getRequestProc) {
resultId = _resultId;
httpRequest.open('get', file);
httpRequest.onreadystatechange = getRequestProc;
httpRequest.send(null);
}

function getRequest() {
if (httpRequest.readyState == 4) {
	result=httpRequest.responseText;
}
}

function checkTask() {
	sendRequest('check_task.php', 'result', getRequest);
	timer1=setTimeout("tic_tac()",1000);
}

function tic_tac() {
	if (result=="READY") document.f1.submit();
	else if (result=="WAIT") alert("Wait until your previous task will be finished!");
	else timer1=setTimeout("tic_tac()",1000);
}

var httpRequest = createHttpRequest();
var result="";