kvrmedia on "[Plugin: Contact Form 7] How to preset select box in the form using a link from another page"

Dear contact form 7 team,
is it possible to preset a select field, in the contact form when linking to the page containing the contact form?
How do I link to the my page containing the contact form to do so?
E.g. I would like to preset the travel period at http://www.karmasurfretreat.com/book-now.html calling this page with a link from another one.

Kind regards,
Jens

http://wordpress.org/extend/plugins/contact-form-7/