<?
if (isset($_POST['submit']))
{
  $new_text = $_POST['text'];
  file_put_contents('index.html', $new_text);
}
 $text = file_get_contents('index.html');
?>
<form method='post' action='admin.php'>
 <textarea name='text' id='text'><?=$text?></textarea>
 <input type='submit' name='submit' value='Сохранить' />
</form>
<!-- TinyMCE -->
<script type="text/javascript" src="/js/tiny_mce/tiny_mce.js"></script>
<script type="text/javascript">
	tinyMCE.init({
		mode : "textareas",
		theme : "advanced",
		language: "ru",
		editor_deselector : "mceNoEditor",
		convert_urls : false,
		width: "100%",
		height: "375px"
	});
</script>
<!-- /TinyMCE -->