jquery - JavaScript alert Undefined clicked

Question

I'm using Responsive Image maps jQuery Plugin (https://github.com/stowball/jQuery-rwdImageMaps) And i'm trying to make when i click on image map that popup opens. In that idea i succeded but when i click on my image-map first it says JavaScript alert: Undefined clicked and on the end of page it's Open popup window " title="Bubbles" alt="Bubbles" /> but the site still works.. I can't provide fiddle for this because it's to large but here is the link you can view the source: http://kgv-projekt.hr/test/

So my final question is how to delete that javascript alert box because i don't want it.. I want when i click on my image map that popup only opens..

Answer 1

Remove:

$('area').on('click', function() {
    alert($(this).attr('alt') + ' clicked');
});