<html>
<head>
<title></title>
<style type="text/css">
#img2 {
position: absolute;
left: 200px;
top: 100px;
}
</style>
<script type="text/javascript">
function dataBase() {
var elem = document.getElementById('img2'),
top = elem.style.top
|| window.getComputedStyle
? window.getComputedStyle(elem, null).top
: elem.currentStyle.top;
alert(top);
}
</script>
</head>
<body>
<img src="pic2.gif" id="img2" alt="" />
<input type="button" value=" Координата у " onclick="dataBase();" />
</body>
</html>