Age Verification Plugin

Hello guys!

I’m looking for a plugin that checks user age before entering the blog.
I found the Age Verfication plugin in this thread http://wordpress.org/support/topic/plugin-age-verification-age-verify-script-i-fixed-this-to-work-in-ie-and-ff?replies=7

I already installed it and it works, but I’m having a hard time styling it, each time the age-verification.php is edited, no matter if it’s a simple space, character or html code, it brakes…

I wonder if someone has edited it succesfully. Any recommendations would be great.

Thanks!