interstitial.js

    $(".switch form").submit(function() {
      $("").interstitial('open', {
        'url' : '/gas-electricity/moving-home/completing-your-switch/?' + $(this).serialize()
      });
      
      $.ajax({
        type: "POST",
        url: $(this).attr("action"),
        data: $(this).serialize(),
        error: function(jq, textStatus, errorThrown) {
          console.log(jq.getAllResponseHeaders());
          // console.log(textStatus);
          // console.log(errorThrown);
        }
      });

      return false;
    });