[Plugin: Contact Form 7] Redirect

Hello,
I have problem with redirect to thank you page.
tried everything but doesnt seem to be working.
I have wordpres 3.0 contact form Version 2.3
any solutions?

Is there any way to add onClick function to the submit button?
onClick=”href…..” somethink like that? or
user php header function?
tried to add header function to classes.php file arround line 83
where it says:

if ( $_POST['_wpcf7_mail_sent']['ok'] ) {

					$class .= ' wpcf7-mail-sent-ok';
					$content = $_POST['_wpcf7_mail_sent']['message'];

but did not work

what does script.js file do exactly, I am confused! when I disable this file (script.js) the form still works!
and in the edit section of the plugins it says:
“Editing contact-form-7/scripts.js (inactive)” why is that?

Please heeeeeeeeeeeeeelp
Thanks

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