function assign($tpl_var, $value = null)
	{
		if (is_array($tpl_var)){
			foreach ($tpl_var as $key => $val) {
				if ($key != '') {
					$this->_tpl_vars[$key] = $val;
				}
			}
		} else {
			if ($tpl_var != '')
			$this->_tpl_vars[$tpl_var] = $value;
		}
	}