Upload image menggunakan TinyMCE pada codeigniter

class Berita extends Controller{
	function Berita(){
		parent::Controller();
                $this->load->plugin('xinha');
                $this->xinha=javascript_xinha(array('post_content'),array('InsertSmiley'),"blue-look");
		if(!$this->session->userdata('logged_in')&& !$this->session->userdata('username')) // tambahkan
		redirect(base_url(),'refresh');
	}

<td>Isi Berita<br><textarea name="isi" cols="50" rows="20"><?php echo $isi;?></textarea></td>
  </tr>
  <tr>
 
    <td><select name="kategori">
 
		 <?php 
 				 $kat=$this->mkategori->getkategori();
 				 foreach($kat->result() as $kategori):
				if($kategori_id==$kategori->id){
					$select="selected='elected'";
 
				}
				else {
				$select="";
				}
				?>
		<option value="<?php echo $kategori->id;?>" <?php echo $select;?>><?php echo $kategori->nama_kategori?></option>
		<?php endforeach;?>
		</select>
	</td>