[Fast Secure Contact Form] Adding Additional Validation

I am using default values as input labels and have javascript code to remove the value onclick. The problem is that if the user does not click on the field and submits the form, it will validate the default value that I set.

So… I need to validate to make sure a form does not equal my value and I would like to use SI Contact Form’s error handling.

something like:
if ($name = 'My Value') { return false; }

Just not sure where to put it

http://ww.wp.xz.cn/extend/plugins/si-contact-form/