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

var http = createRequestObject(); 

function checkFieldLogin(){

if(document.getElementById('ajaxLoginState').value == 0){
http.open('get', 'login/logintest.php');
}else if(document.getElementById('ajaxLoginState').value == 1){
http.open('get', 'login/logintest.php?username=' 
+ document.getElementById('username').value + '&password=' + document.getElementById('password').value);
}else if(document.getElementById('ajaxLoginState').value == 2){
http.open('get', 'login/logout.php');
}
	http.onreadystatechange = handleProducts; 
	http.send(null);
}
function handleProducts(){
	if(http.readyState == 4){ 
		var response = http.responseText;
		document.getElementById('formlog').innerHTML = response;
	}
}