OK, I'm done with the preg_replace() in the paragraph parser. It's too buggy. Replaced with preg_match_all()/str_replace_once().
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>blank_page</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="css/blank.css" rel="stylesheet" type="text/css" />
<base target="_self" />
<script type="text/javascript">
function init() {
if (parent.tinymce.isIE)
document.body.contentEditable = true;
else
document.designMode = 'on';
parent.initIframe(document);
window.focus();
}
</script>
</head>
<body onload="init();">
</body>
</html>