function aLogin(url) 
{
    var req = init();
    req.onreadystatechange = processRequest
    function init() {
      if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
      } else if (window.ActiveXObject) {
        	return new ActiveXObject("Microsoft.XMLHTTP");
      }
    }    

    function processRequest () {
      if (req.readyState == 4) {
        if (req.status == 200) {
		 req = req.responseText;
		 if(req == 'OK ') {
		  window.location.href = 'index.php';
		 } else {
		  document.getElementById('login_response').innerHTML = req;
		 }        
		}
      }
    }

    this.doPost = function(body) {
      req.open("POST", url, true);
      req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      req.send(body);
    }
}

function doLogin() {

  var email = document.getElementById('email').value;
  var paswd = document.getElementById('password').value;
  var remember = document.getElementById('remember').value;
	
  document.getElementById('login_response').innerHTML = '<p style="text-align:center; width:200px;"><img src="images/login.gif"></p><br>';

  var ai = new aLogin('auth.php');

  ai.doPost('email='+escape(email)+'&password='+paswd+'&remember='+remember);

}