[Magneto]

<style type = "text/css">
	a{
		position:relative;
	}
	a span{
		display: none;
		position:relative;
		top:22px;
		left:-40px;
		background-color: white;
		padding:5px;
		color:black;
		outline:1px solid #ccc;
		width:100px;
	}
	a:hover span, span:hover{
		display: inline;
	}
</style>


<a href="#">Ссылка<span>Скрытая штука</span></a>