Я вот что нашел вроди пашет везде кроме хрома
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<div id="dropin" style="position:absolute;visibility:hidden;left:100px;top:100px;width:230px;height:230px;background-color:#EBEBEB"> Здесь находится текст сообщения, картинки и ссылки
</div>
<div><a href="#" onclick="document.getElementById('dropin').style.visibility='visible'" />показать</a></div>
<div><a href="#" onclick="document.getElementById('dropin').style.visibility='hidden'" />скрыть</a></div>
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