EmilioA on "[Plugin: Contact Form 7] Loading JavaScript and Stylesheet Only When it is Necessary"

Hello,
I tried to optimize the loading time of my wordpress site. So I followed the instructions on http://contactform7.com/loading-javascript-and-stylesheet-only-when-it-is-necessary/
But I have the same header file for all pages and when I insert the wpcf7_enqueue_scripts(); wpcf7_enqueue_styles(); before wp_head, the contact form loads on every page again.
Are there other options for loading the plugin only on the contact page?
Thx

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