tinymce buttons

I'm newbie using elgg I tried to configure tinymce editor to show more buttons like media, justify, etc. editing /mod/tinymce/views/default/js/tinymce.php but doesn¡t work anyway :(

I read many documents and webpages how to do it but still doesn't work

 

This is my code actually:

tinyMCE.init({
        mode : "specific_textareas",
        editor_selector : "elgg-input-longtext",
        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,wordcount",
        relative_urls : false,
        remove_script_host : false,
        document_base_url : elgg.config.wwwroot,
         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,
        theme_advanced_path : true,
        width : "100%",
        extended_valid_elements : "a[name|href|target|title|onclick],img[class|src|border=0|alt|title|hspace|vspace|width|height|align|onmouseover|onmouseout|name|style],hr[class|width|size|noshade],font[face|size|color|style],span[class|align|style]",
        setup : function(ed) {
            //show the number of words
            ed.onLoadContent.add(function(ed, o) {
                var strip = (tinyMCE.activeEditor.getContent()).replace(/(<([^>]+)>)/ig,"");
                var text = elgg.echo('tinymce:word_count') + strip.split(' ').length + ' ';
                tinymce.DOM.setHTML(tinymce.DOM.get(tinyMCE.activeEditor.id + '_path_row'), text);
            });

            ed.onKeyUp.add(function(ed, e) {
                var strip = (tinyMCE.activeEditor.getContent()).replace(/(<([^>]+)>)/ig,"");
                var text = elgg.echo('tinymce:word_count') + strip.split(' ').length + ' ';
                tinymce.DOM.setHTML(tinymce.DOM.get(tinyMCE.activeEditor.id + '_path_row'), text);
            });
        },
        content_css: elgg.config.wwwroot + 'mod/tinymce/css/elgg_tinymce.css'
    });

 

Please someboy help me?