proof of concept

var cont = $(jetpack.tabs.focused.contentDocument).find("body");

// Loading the default active corners template

$.ajax({
  url: "http://test.jeromegn.is-a-geek.com/widget/base",
  type: "GET",
  success: function(data, textStatus) {
    cont.append(data);
  },
  complete: function(){
    $(".triggeredContent").css({
      "background-color": "transparent",
      "background-image": "url(http://test.jeromegn.is-a-geek.com/images/corner_bg_sprite.png)",
      "background-repeat": "no-repeat",
      "position": "fixed",
      "width": "300px",
      "height": "300px",
      "display": "none"
    });

    $(".activeCorner").css({
      "background-color": "transparent",
      "position": "fixed",
      "width": "40px",
      "height": "40px"
    });
    
    $(".activeCorner").mouseover(function(){
      relCorner = $($(this).attr("rel"));

      relCorner.fadeIn();
    });

    $(".triggeredContent").mouseout(function(){
      $(this).fadeOut();
    });
  }
});