Sending data to Storyline?

I need to send data to a Storyline course from our website. What's the best way to do that?  Currently I'm setting a cookie in my server-side code then reading that in a JavaScript file I include in story.html.  I'm doing something like the below but I'm wondering if there's an easier way I'm missing.

function readCookie(name) {

  var nameEQ = name + "=";

  var cookieArray = document.cookie.split(';');

  for (var i = 0; i < cookieArray.length; i++) {

    var cookie = cookieArray[i].replace(/^\s+/, '');

    if (cookie.indexOf(nameEQ) == 0) {

      return cookie.substring(nameEQ.length, cookie.length);

    }

  }

  return null;

}

var documentLoadedTest = setInterval(function() {

    if (document.readyState === "complete") {

      var player = GetPlayer();

      if (player.SetVar) { 

      var inputData = readCookie("InputData");

      player.SetVar("InputData", inputData);

      clearInterval(documentLoadedTest);

    }

 }

}, 10);