public function setConfig($config = array()) 
    { 

    	if(is_array($config) ) {

    		if(!empty($config)) {
    			foreach($config as $key=>$value) {

    				$this->_config[$key] = $value;
    			}
    		}

     	} else {
    		
    		throw new Exception( "Invalid parameter");
    	}

    }