function login(){
	var layer;
	layer = document.getElementById('overlay');
	layer.innerHTML = '<div id="overlayer"><form action="" method="post">'+
	'<fieldset>'+
	'<legend>Inloggen</legend>'+
	'<p><label for="user">Gebruikersnaam</label><input type="text" id="user" name="user" size="12" /></p>'+
	'<p><label for="pass">Wachtwoord</label><input type="password" id="pass" name="pass" size="12" /></p>'+
	'<input id="button" type="image" src="/images/button_login.jpg" />'+
	'</fieldset>'+
	'</form></div>';
	layer.style.opacity = 0;
	layer.style.display = 'block';
	layer.morph('opacity:1', {duration: 0.5});
	document.getElementById('overlay').onclick=function(){hidelayer();}
	function hidelayer(){
		layer.morph('opacity:0', {duration: 1, afterFinish: function() {
			layer.innerHTML = '';
		}});
	}
}