Invoking TinyMCS from jquery based on http://tinymce.moxiecode.com/examples/example_22.php

jquery-tinymce-example.js

<!-- Load jQuery -->
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
	google.load("jquery", "1.3");
</script>

<!-- Load jQuery build -->
<script type="text/javascript" src="<your installation path>/tiny_mce/tiny_mce.js"></script>
<script type="text/javascript">
tinyMCE.init({
	// General options
	mode : "textareas",
	theme : "advanced",
	plugins : "safari,pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template",

	// Theme options
	theme_advanced_buttons1 : "save,newdocument,|,bold,italic,underline,strikethrough,|,justifyleft,justifycenter,justifyright,justifyfull,|,styleselect,formatselect,fontselect,fontsizeselect",
	theme_advanced_buttons2 : "cut,copy,paste,pastetext,pasteword,|,search,replace,|,bullist,numlist,|,outdent,indent,blockquote,|,undo,redo,|,link,unlink,anchor,image,cleanup,help,code,|,insertdate,inserttime,preview,|,forecolor,backcolor",
	theme_advanced_buttons3 : "tablecontrols,|,hr,removeformat,visualaid,|,sub,sup,|,charmap,emotions,iespell,media,advhr,|,print,|,ltr,rtl,|,fullscreen",
	theme_advanced_buttons4 : "insertlayer,moveforward,movebackward,absolute,|,styleprops,|,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,template,pagebreak",
	theme_advanced_toolbar_location : "top",
	theme_advanced_toolbar_align : "left",
	theme_advanced_statusbar_location : "bottom",
	theme_advanced_resizing : true,

	// Example content CSS (should be your site CSS)
	content_css : "css/example.css",

	// Drop lists for link/image/media/template dialogs
	template_external_list_url : "js/template_list.js",
	external_link_list_url : "js/link_list.js",
	external_image_list_url : "js/image_list.js",
	media_external_list_url : "js/media_list.js",

	// Replace values for the template plugin
	template_replace_values : {
		username : "Some User",
		staffid : "991234"
	}
});
</script>

<form method="post" action="somepage">
	<textarea name="content" style="width:100%">
	</textarea>
</form>