upload_helper.php

function upload($folder_name,$field_name,$allow_type='',$size=500){
		//echo $allow;die();
		$CI =& get_instance();	

		$config['upload_path']          = './upload/'.$folder_name;
		$config['allowed_types']        = $allow_type;
		
		$config['max_size']             = $size;

		$new_name = time().$_FILES[$field_name]['name'];
		$config['file_name']			= $new_name;
		
		$CI->load->library('upload', $config);
		$CI->upload->overwrite = true;
		
		if ( ! $CI->upload->do_upload($field_name)){ 

				$error = array('status'=>FALSE,'error' => $CI->upload->display_errors());
				return($error);
		}
		else
		{
				$data = array('status'=>TRUE,'upload_data' => $CI->upload->data());
				return($data);
		}
	}