in HTML:
...
<link rel="stylesheet" href="static/css/PixelGreen.css" type="text/css" />
<script language="javascript" src="static/js/mootools.js" ></script>
<script language="javascript" src="static/js/events.js" ></script>
...
<div id="auth_options"><a id="v_toggle"> Login</a>
...

in CSS:
...
#auth_options {
	padding-top: 66px;
	float: right;
	padding-right: 13px;
	vertical-align: center;
}

#auth_options img {
	background: none;
	border: 0px;
}

#login {
/*	display: none; */
	padding-top: 98px;
	padding-right: 10px ;
	margin: 1px;
	float: right;
}
...

in events.js:
window.addEvent('domready', function() {
	var status = {
		'true': 'open',
		'false': 'close'
	};

	//-vertical

	var myVerticalSlide = new Fx.Slide('login').hide();
	$('v_toggle').addEvent('load', function(e){
		e.stop();
		myVerticalSlide.toggle();
	});

	var myVerticalSlide = new Fx.Slide('login').hide();
	$('v_toggle').addEvent('click', function(e){
		e.stop();
		myVerticalSlide.toggle();
	});

	// When Vertical Slide ends its transition, we check for its status
	// note that complete will not affect 'hide' and 'show' methods
	myVerticalSlide.addEvent('complete', function() {
		$('vertical_status').set('html', status[myVerticalSlide.open]);
	});
});