[Plugin: Contact Form 7] Form Fields not Validating

My Contact Form 7 form in WP is not validating the fields at this site

I can type just letters into the fields and it doesn’t check whether the email address etc is in the correct formats.

Is this likely to be a Plugin conflict affecting the javascript?

Any help really appreciated…

http://ww.wp.xz.cn/extend/plugins/contact-form-7/