Add a url param to all links on a page

gistfile1.js

$(document).ready(function() {
  var paramToAdd = "function called to fill this variable"
  if (paramToAdd.length > 0) {
      $("a").attr('href', function (i, h) {
          //try catch needed for odd links(Ex: the slider nav squares when using Flexslider)
          try {
              var invalidLink = h.lastIndexOf("tel:", 0) === 0 || h.lastIndexOf("mailto:", 0) === 0;
              if (!invalidLink) {
                  return h + (h.indexOf('?') != -1 ? "&param=" + paramToAdd : "?param=" + paramToAdd);
              }
          }
          catch (err) {
          }
      });
  }
});