<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>

#container {
    width: 385px;
}

img {
    margin-top:1em;
    display: block;
    background-color:yellow;
}

.foo { float:left;width:100px; height:100px;background-color:green }

</style>
</head>

<body>
<div id="container">
<div>The yellow block should be below the green block.</div>
<div class="foo"></div><img width="395" height="275" border="0">
</div>
</body>
</html>