var NORMAL_STATE = 4;
var LOGIN_PREFIX = 'do_login.php?';
var http = getHttpObject(); 
var success = false;


function validateLogin(){
  username = document.getElementById('username').value;
  password = document.getElementById('password').value;
  origin = document.getElementById('origin').value;
  if (username != '' && password  != '') {      
    http.open('GET', LOGIN_PREFIX + 'username=' + username+'&password=' + password, true);
    
    http.onreadystatechange = function() {
  
      if (http.readyState == 4 || http.readyState == "complete") {
        results = http.responseText.split('|');
        
        if (results[0] == 200) {
          window.location = "login_redirect.php?origin=" + origin;
        } else {
          document.getElementById('username_error_login').innerHTML = 
            "Invalid username";
          
          document.getElementById('password_error_login').innerHTML = 
          "or password";
        } 
      }      
      return false; 
    }
    
    http.send(null);
  } 
  return false;
}