protected function loadJpGraph( $types = array() )
	{
		if( $this->pathJpGraph === NULL )
			throw new RuntimeException( 'Path to JpGraph has not been set.' );
		$types	= explode( ",", $types );
		require_once( $this->pathJpGraph."src/jpgraph.php" );
		foreach( $types as $type )
		{
			$plotType	= strtolower( trim( $type ) );
			$fileName	= $this->pathJpGraph."src/jpgraph_".$plotType.".php";
			require_once( $fileName );
		}
	}