tinymce kullanabilirsin,google'dan aratıp indir kullanacagın dizine kopyala
daha sonra kullanacagın dosyayı ac ve su sekilde ekle
<script type="text/javascript" src="editor/js cripts/tiny_mce/tiny_mce.js"></script>
ve son olarakda altına hemen bunu ekle

<script language="javascript" type="text/javascript">
  tinyMCE.init({
  mode : "textareas",
    theme : "advanced",
    elements : "elm1",
    theme_advanced_toolbar_location : "top",
    theme_advanced_buttons1 : "bold,italic,underline,strikethrough,separator,"
    + "justifyleft,justifycenter,justifyright,justifyfull,formatselect,"
    + "bullist,numlist,outdent,indent",
    theme_advanced_buttons2 : "link,unlink,anchor,image,separator,"
    +"undo,redo,cleanup,code,separator,sub,sup,charmap",
    theme_advanced_buttons3 : "",
    height:"350px",
    width:"600px",
    file_browser_callback : 'myFileBrowser'
  });
  function myFileBrowser (field_name, url, type, win) {
    var fileBrowserWindow = new Array();
    fileBrowserWindow['title'] = 'File Browser';
    fileBrowserWindow['file'] = "my_cms_script.php" + "?type=" + type;
    fileBrowserWindow['width'] = '420';
    fileBrowserWindow['height'] = '400';
    tinyMCE.openWindow(fileBrowserWindow, { window : win, resizable : 'yes', inline : 'yes' });
    return false;
  }
</script>