DOCTYPE HTML PUBLIC W3C DTD XHTML Strict EN http www w3 org TR xhtml1

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Example show/hide block</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript">
function show() {
if (document.getElementById('main').style.display == 'none') {
document.getElementById('main').style.display = 'block';
} else {
document.getElementById('main').style.display = 'none';
}
}
</script>
<style type="text/css">
#main {
margin: 20px; padding: 10px;
border: 1px solid #ddd;
}
</style>
</head>
<body>
<a href="#" onclick="show()">Показать / Скрыть</a>
<div id="main">
Мой контент.
</div>
</body>
</html>