<style>

div { position:absolute; top:50px; left:50px; width:150px; height:50px; border:1px solid #eee; display:none; filter:alpha(opacity:70); opacity: 0.7; background:#fff;  }

</style>
<img src="" /><div></div>
<script>
var n = document.getElementsByTagName("img")[0]
var d = document.getElementsByTagName("div")[0]
var i = document.all

if(i)
{
	n.attachEvent("onmouseover",open)
	n.attachEvent("onmouseout",close)
}
else 
{
	n.addEventListener("mouseover",open, false);
	n.addEventListener("mouseout", close, false);
}

function open()
{
	d.innerHTML = "falan filan";
	d.style.display = "block";
}
function close()
{
	d.style.display = "none";
}
</script>