gruant,
that is strange... when I log into the WebAssist site, when I first select an input to focus, it becomes the blue color which is on the rest of the WebAssist site. Then if I enter a valid input, it turns to green. If it is invalid, it turns to red. Sounds like what your experiencing may be browser and/or OS specific. I am running Mac OSX 10.6 with Firefix and have not been able to replicate. My guess is that your running IE which may apply its own default behaviors to forms.
Regards,
Brian