simpledomready.js

function domReady(callback) {
    var domLoaded;
    var called;

    var onReadyStateChange = function () {
      if (document.readyState == 'complete') {
        domLoaded();
      }
    };

    var interval;

    var pollForReady = function () {
      try {
        document.documentElement.doScroll('left');
        domLoaded();
      }
      catch(e) {}
    };

    if (window.addEventListener) {
      domLoaded = function() {
        if (!called) {
          called = true;
          callback();
        }
        window.removeEventListener('DOMContentLoaded', domLoaded, false);
        window.removeEventListener('load', domLoaded, false);
      };

      window.addEventListener('DOMContentLoaded', domLoaded, false);
      window.addEventListener('load', domLoaded, false);
    } else if (window.attachEvent) {
      interval = window.setInterval(pollForReady, 13);

      domLoaded = function() {
        if (!called) {
          called = true;
          callback();
        }
        window.clearInterval(interval);
        window.detachEvent('onreadystatechange', onReadyStateChange);
        window.detachEvent('onload', domLoaded);
      };

      window.attachEvent('onreadystatechange', onReadyStateChange);
      window.attachEvent('onload', domLoaded);
    }

  }