[Bernoli]

שאתה שם את הקוד JS בעמוד אתה משנה לrtl

<script language="javascript" type="text/javascript" src="jscripts/tiny_mce/tiny_mce.js"></script>
<script language="javascript" type="text/javascript">
    tinyMCE.init({
        mode : "textareas",
        theme : "advanced",
        language: "he",
        plugins : "safari,spellchecker,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,pagebreak,imagemanager,filemanager",
        theme_advanced_buttons1_add_before : "save,newdocument,separator",
        theme_advanced_buttons1_add : "fontselect,fontsizeselect",
        theme_advanced_buttons2_add : "separator,insertdate,inserttime,preview,separator,forecolor,backcolor",
        theme_advanced_buttons2_add_before: "cut,copy,paste,pastetext,pasteword,separator,search,replace,separator",
        theme_advanced_buttons3_add_before : "tablecontrols,separator",
        theme_advanced_buttons3_add : "emotions,iespell,media,advhr,separator,print,separator,rtl,rtl,separator,fullscreen",
        theme_advanced_buttons4 : "insertlayer,moveforward,movebackward,absolute,|,styleprops,|,spellchecker,cite,abbr,acronym,del,ins,attribs,|,visualchars,nonbreaking,template,blockquote,pagebreak,|,insertfile,insertimage",
        theme_advanced_toolbar_location : "top",
        theme_advanced_toolbar_align : "right",
        theme_advanced_statusbar_location : "bottom",
        content_css : "/example_data/example_full.css",
        plugin_insertdate_dateFormat : "%Y-%m-%d",
        plugin_insertdate_timeFormat : "%H:%M:%S",
        external_link_list_url : "example_data/example_link_list.js",
        external_image_list_url : "example_data/example_image_list.js",
        flash_external_list_url : "example_data/example_flash_list.js",
        template_external_list_url : "example_data/example_template_list.js",
        theme_advanced_resize_horizontal : false,
        directionality : "rtl",
        theme_advanced_resizing : true,
        apply_source_formatting : true,
        spellchecker_languages : 
        "+English=he,Danish=da,Dutch=nl,Finnish=fi,French=fr,German=de,Italian=it,Polish=pl,Portuguese=pt,Spanish=es,Swedish=sv"
    });
function fileBrowserCallBack(field_name, url, type, win) {
        // This is where you insert your custom filebrowser logic
        alert("Filebrowser callback: field_name: " + field_name + ", url: " + url + ", type: " + type);

        // Insert new URL, this would normaly be done in a popup
        win.document.forms[0].elements[field_name].value = "someurl.htm";
    }
</script>

וגם את textarea אתה עושה rtl

 <textarea name="name" dir="rtl" rows="10" cols="10"></textarea>

בהצלחה !