Create wp mashshare popup button to work with Mailchimp

I'm looking for someone who is familiar with the mashshare social buttons wp plugin, and also familiar with mailchimp. I am trying to create a popup mailchimp subscription from the mashshare subscribe button, and so far there has been no way I've found to add the javascript directly to the button. I need someone who knows how to modify the mashshare button to use the mailchimp javascript and create a popup subscribe button.