<html><head><body>
<script>
function hide(id) {
document.getElementById(id).style.visibility = "hidden"
}
function unhide(id) {
document.getElementById(id).style.visibility = "visible"
}
</script>
<img src="smallpic.jpg" width="30px" height="30px" onmouseover="unhide('div1')" onmouseout="hide('div1')" />
<div id="div1"
style="position:absolute;left:200px;top:100px;
width:200px;height:200px;background:yellow;
border:medium solid red; padding:10px;
visibility:hidden">BIG PICTURE HERE<br />
<div align="right">
<input type="button" value="Close" onclick="hide('div1')" />
</div></div><body></html>