async version of INFOnline tracking script

iomAsync.js

(function () {
  var iomCalls = [];

  window.iomAsync = {
    c: function() {
      iomCalls.push(arguments);
    }
  };

  var script = document.createElement("script");
  script.onload = function () {
    iomCalls.forEach(function (iomCall) {
      window.iom.c.apply(null, iomCall);
    });
    window.iomAsync = window.iom;
  };
  script.async = true;
  script.src = "https://script.ioam.de/iam.js?m=1";
  document.head.appendChild(script);
})();