replace_characters.js

gistfile1.js

<script id="replace_usd_for_stg">
  jQuery(document).ready(function($) {
    $(function() {
      var selector  = '.moonray-form-element-cart'; // use an id #if_you_can
      var mystring  = $(selector).html();
      var output    = mystring.replace(/\$/g, "£").replace(/\(USD\)/g, "\(STG\)");
      $(selector).html(output);
    });
  });
</script>