DOM Ready event

domready.js

window.domReady = function(callback) {
  var ready = false;

  var detach = function() {
    if(document.addEventListener) {
      document.removeEventListener("DOMContentLoaded", completed);
      window.removeEventListener("load", completed);
    }
    else {
      document.detachEvent("onreadystatechange", completed);
      window.detachEvent("onload", completed);
    }
  }
  var completed = function() {
    if(!ready && (document.addEventListener || event.type === "load" || document.readyState === "complete")) {
      ready = true;
      detach();
      callback();
    }
  };

  if(document.readyState === "complete") {
    callback();
  }
  else if(document.addEventListener) {
    document.addEventListener("DOMContentLoaded", completed);
    window.addEventListener("load", completed);
  }
  else {
    document.attachEvent("onreadystatechange", completed);
    window.attachEvent("onload", completed);

    var top = false;

    try {
      top = window.frameElement == null && document.documentElement;
    }
    catch(e) {

    }

    if(top && top.doScroll) {
      (function scrollCheck() {
        if(ready) return;

        try {
          top.doScroll("left");
        }
        catch(e) {
          return setTimeout(scrollCheck, 50);
        }

        ready = true;
        detach();
        callback();
      })();
    }
  }
};