loading javascript dynamically

loadScript.js

function loadScript(url, func) {
  var script = document.createElement("script");
  if (script.addEventListener) {
    script.addEventListener("load", func, false);
  } else if (script.attachEvent) {
    script.attachEvent("onreadystatechange", function() {
      var target = window.event.srcElement;
      if ((target.readyState == "loaded") || (target.readyState == "complete")) {
        func();
      }
    });
  }
  script.setAttribute("type", "text/javascript");
  script.setAttribute("src", url);
  document.getElementsByTagName("head")[0].appendChild(script);
}


// There is also a Script loader plugin for jQuery, see http://code.google.com/p/jquery-loadscript/