function login_start() {
    
    var postvalue = 'username='+encodeURI(document.getElementById('mod_login_username').value)+
                     '&password='+encodeURI(document.getElementById('mod_login_password').value);
    post(postvalue, 'ajax/login.php', login_done);
  }

function logout_start() {
    
    var postvalue = '';
    post(postvalue, 'ajax/login.php', login_done);
  }

function login_done() {

 if(http_request.readyState == 4) {
     if(
        returnDocument() == 'user_orderdata.php' ||
        returnDocument() == 'user_userdata.php' ||
        returnDocument() == 'user_traceorder.php'
      ) {
        window.location.reload();
     } else {
        document.getElementById('module-login').innerHTML = http_request.responseText;
     }
  }
}
  
function sendpassword_start() {
    var postvalue = 'email='+encodeURI(document.getElementById('mod_forgotpassword_email').value);
    post(postvalue, '../ajax/login_forgotpassword.php', sendpassword_done);
}

function sendpassword_done() {
  if(http_request.readyState == 4) { 
     document.getElementById('modalwindow').innerHTML = http_request.responseText;
  }
}