How do I get rid of a tooltip using jquery

I have tried the following code to remove the alt tag tool tip from anchor. Here is the site The images in the portfolio I am trying to remove the tooltip from using jquery because its a purchased theme a friend is using and I cant figure out where to get rid of the alt tag in the wordpress code.

jQuery(document).ready(function($) {

     $('.loader').click(function(e) { 
         e.preventDefault(); 
         $('.loader').removeAttr('alt');
      });

});