The script has built in php protection from auto spam submission that works great.
You can ban words and site addresses. Please read the instructions on the wTag web site on how to use the anti spam filter.

I'm the owner of this site
www.q8ieng.com or .net

I've faced thousands of spams daily from the shoutbox I'm using right now, but with my friends we did upgraded it to use the Captcha image..

I'll tell you, your script will be a big failure to your success unless you make it work with captcha, otherwise it'll not be able to stop spams

just a simple advice :)