Captcha image problem

Hello!

My WP blog is installed under /wp/ directory.
I have found that there is no captcha image shown, because captcha image URL `<img style=”<?=$antispamcontent;?>” src=”<?=$url;?>/wp-content/plugins/dmsguestbook/captcha/captcha.php”>
point to wrong location (in my case).

I have changed it manually in dmsguestbook.php, but it still need to be fixed, I guess..