jQuery(document).ready(function($){
  $('.content').live('mouseover', function() { // When hovering over any element with the '.content' class - change as you require
    $('.manual-optin-trigger[data-optin-slug=u6mkwuqm0xf6g94d]').trigger('click'); // Change 'u6mkwuqm0xf6g94d' to match your specific optin slug
  });
});