В шапке страницы размещаем код:

<script type="text/javascript" src="js/cms/wysiwyg/tinymce/jscripts/tiny_mce/tinymce_defs.js"></script>
<script type="text/javascript" src="js/cms/wysiwyg/tinymce/jscripts/tiny_mce/tinymce_custom.js"></script>
<script type="text/javascript" src="js/cms/wysiwyg/tinymce/jscripts/tiny_mce/tiny_mce_src.js"></script>
<script type="text/javascript">
<![CDATA[
tinyMCE.init({
mode : "textareas",
theme : "simple"});
</script>