Kod: Zaznacz cały
<head>
<style>
#a {background:#a00; position:absolute; top: 10px; left: 10px; width: 200px; height: 200px;}
#b {background:#0a0; position:absolute; top: 12px; left: 12px; width: 100px; height: 100px;}
#c {background:#00a; position:absolute; top: 100px; left: 100px; width: 100px; height: 100px;}
</style>
</head>
<body>
<div id="a">
<div id="b">
</div>
</div>
<div id="c" >
</div>
<script type="text/javascript">
document.getElementById("c").style.top = "12px";
</script>
</body>