Python and Mechanize form submittal using value name
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I'm attempting to use mechanize and Python to scrape a webpage to follow a link that is really a hidden form.  In other words, I'd like to submit a form using it's value name, "rejoin".  

I've successfully logged into the page, retrieved the HTML and am now stuck on how to parse for value name "rejoin" and submit. I've tried using the find_control.value() method but that just returns a list.  

Thanks for any pointers you may have.

Here's the form HTML

    <td><form action="https://post.someplace.com/12345" method="POST"><input type="hidden"
    name="U2FsdGVk:X18yMDQ3NzIwNDdj8tayCg-eidV1:i:pqAf-k-RDLN9WMUB:w" value="rejoin"><input
    type="hidden" name="U2FsdGVkX18yMDQ3NzIwNAYJo9WGdQwIuU0nFRLIxk4uuwczmrU9..Dw" 
    value="U2FsdGVkX18yMDQ3NzIwNEiOVUIxlWPNAs3X-q2gZrYC5Ht8M23ghg"><input type="submit" 
    name="go" value="rejoin" class="managebtn"></form></td>