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<html>
<head>
<style>
body, html {
height: 100%;
}
.spacer {
height: 80%;
}
</style>
</head>
<body onload='(parent || opener).childLoad()'>
<div class="spacer"></div>
<div id="content">content</div>
<div class="spacer"></div>
</body>
</html>