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<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<h2>kfkdkd</h2>
<h2>ww</h2>
<script>
var h = document.getElementsByTagName('h2'),
target, new_elem;
for (i = 0; i < h.length; i++) {
new_elem = document.createElement('div');
new_elem.innerHTML = "baga";
target = h[i];
target.parentNode.insertBefore(new_elem, target.nextSibling);
}
</script>
</body>
</html>