function checkLogin() {
	var form_vars = ajaxObj.getForm('form_login');
	ajaxObj.format = 'TEXT';
	ajaxObj.call('mod=users&file=login'+form_vars,ctrlLog);
	return false;
}
function checkLogout() {
	ajaxObj.format = 'TEXT';
	ajaxObj.call('mod=users&file=logout',ctrlLog);
	return false;
}
function ctrlLog(resp) {
	if(resp == 'LOGIN') {
		location.reload(true);
	} else if(resp == 'LOGOUT') {
		location.replace(urlHomepage);
	} else if(resp != '') {
		alert(resp);
	} else {
		alert('Dati di accesso non validi');
	}
}