protected function configure() {
		// set thumbnails path
		$path = $this->options['tmbPath'];
		if ($path) {
			if (!file_exists($path)) {
				if (@mkdir($path)) {
					chmod($path, $this->options['tmbPathMode']);
				} else {
					$path = '';
				}
			} 
			
			if (is_dir($path) && is_readable($path)) {
				$this->tmbPath = $path;
				$this->tmbPathWritable = is_writable($path);
			}
		}

		// set image manipulation library
		$type = preg_match('/^(imagick|gd|auto)$/i', $this->options['imgLib'])
			? strtolower($this->options['imgLib'])
			: 'auto';

		if (($type == 'imagick' || $type == 'auto') && extension_loaded('imagick')) {
			$this->imgLib = 'imagick';
		} else {
			$this->imgLib = function_exists('gd_info') ? 'gd' : '';
		}
		
	}