I'd nest the original <div> in a wrapper <div>, setting each to position:relative; and a z-index of 1. Then nest a second <div> in the wrapper for your overlay, set to position:absolute with a z-index of 2. Then a mouseover attribute on the wrapper would toggle the style.visibility on the overlay <div>. It's up to you what appears in the overlay, but you could pull a title attribute with JavaScript.
Code:
<div class="overlayWrapper" onmouseover="visible();" onmouseout="invisible();">
<div id="yourOriginalDIV">...</div>
<div class="overlayDIV">...</div>
</div>
Rick Trethewey
Rainbo Design
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