Hello there. Great job on the plugin but I have an issue with it. I use the WP-Cache plugin and because the contact form is being cached, it's not allowing the CAPTCHA image to change on a refresh. Instead, the CAPTCHA image is being cached and then the image disappears and the images don't work unless I either delete the cache or turn WP-CACHE off. Can you give me a WP-CACHE rule where this plugin or page is not cached or could you tell me how to make sure the CAPTCHA plays nice with CACHEING solutions?