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<html>
<head>
    <title>Test</title>
    <!--<link type="text/css" rel='stylesheet' href='1.css'/>
    <script src="jquery-2.0.3.min.js"></script>-->
</head>
<body>
<script src="https://vk.com/js/api/openapi.js" type="text/javascript"></script>

<div id="login_button" onclick="VK.Auth.login(authInfo);"></div>

<script language="javascript">
VK.init({
  apiId: 5785736
});
function authInfo(response) {
  if (response.session) {
    alert('user: '+response.session.mid);
  } else {
    alert('not auth');
  }
}
VK.Auth.getLoginStatus(authInfo);
VK.UI.button('login_button');
</script>

</body>