Redirect to a specific page after successful form submission

Hi guys

Wondered if anyone could help a man very much in need?!

I have a Mailchimp sign up form on my SS website and once this code below has run, I need to redirect the user to a specific thank you page on my website (I can't use the mailchimp one as it would be generic thank you page for all forms which I can't have).

Any ideas what code I need to add to redirect to the page of my choice?

This is the code block. 

<!-- Begin Mailchimp Signup Form -->
<link href="//cdn-images.mailchimp.com/embedcode/classic-10_7.css" rel="stylesheet" type="text/css">
<style type="text/css">
	#mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif; }
	/* Add your own Mailchimp form style overrides in your site stylesheet or in this style block.
	   We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. */
</style>
<div id="mc_embed_signup">
<form action="https://fifimcgee.us11.list-manage.com/subscribe/post?u=225d7026582056e65708f3bfb&amp;id=fbb24ea6b2" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate>
    <div id="mc_embed_signup_scroll">
	<h2>Subscribe</h2>
<div class="indicates-required"><span class="asterisk">*</span> indicates required</div>
<div class="mc-field-group">
	<label for="mce-EMAIL">Email Address  <span class="asterisk">*</span>
</label>
	<input type="email" value="" name="EMAIL" class="required email" id="mce-EMAIL">
</div>
<div class="mc-field-group">
	<label for="mce-FNAME">First Name </label>
	<input type="text" value="" name="FNAME" class="" id="mce-FNAME">
</div>
	<div id="mce-responses" class="clear">
		<div class="response" id="mce-error-response" style="display:none"></div>
		<div class="response" id="mce-success-response" style="display:none"></div>
	</div>    <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
    <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_225d7026582056e65708f3bfb_fbb24ea6b2" tabindex="-1" value=""></div>
    <div class="clear"><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button"></div>
    </div>
</form>
</div>
<script type='text/javascript' src='//s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js'></script><script type='text/javascript'>(function($) {window.fnames = new Array(); window.ftypes = new Array();fnames[0]='EMAIL';ftypes[0]='email';fnames[4]='MMERGE4';ftypes[4]='text';fnames[1]='FNAME';ftypes[1]='text';fnames[6]='MMERGE6';ftypes[6]='text';fnames[7]='MMERGE7';ftypes[7]='text';fnames[8]='MMERGE8';ftypes[8]='text';fnames[9]='MMERGE9';ftypes[9]='text';fnames[10]='MMERGE10';ftypes[10]='text';fnames[11]='MMERGE11';ftypes[11]='text';fnames[12]='MMERGE12';ftypes[12]='text';fnames[2]='MMERGE2';ftypes[2]='text';fnames[3]='MMERGE3';ftypes[3]='text';fnames[5]='LNAME';ftypes[5]='text';fnames[14]='MMERGE14';ftypes[14]='text';fnames[15]='MMERGE15';ftypes[15]='text';fnames[16]='MMERGE16';ftypes[16]='text';fnames[17]='MMERGE17';ftypes[17]='text';fnames[18]='MMERGE18';ftypes[18]='date';fnames[19]='MMERGE19';ftypes[19]='text';fnames[21]='MMERGE21';ftypes[21]='text';fnames[20]='MMERGE20';ftypes[20]='text';}(jQuery));var $mcj = jQuery.noConflict(true);</script>
<!--End mc_embed_signup-->