compatible domReady

domReady.js

// initialize when DOM content is loaded
var domReady = function() {
  var fns = [];
  var init = function() {
    if (!arguments.callee.done) { // run init functions once
      arguments.callee.done = true;
      for (var i = 0; i < fns.length; i++) {
        fns[i]();
      }
    }
  };
  // listeners for different browsers
  if (document.addEventListener) {
    document.addEventListener('DOMContentLoaded', init, false);
  }
  if (ua.ie) {
    (function() {
      try {
        // throws errors until after ondocumentready
        document.documentElement.doScroll('left');
      } catch (e) {
        setTimeout(arguments.callee, 50);
        return;
      }
      // no errors, fire
      init();
    })();
    // trying to always fire before onload
    document.onreadystatechange = function() {
      if (document.readyState === 'complete') {
        document.onreadystatechange = null;
        init();
      }
    };
  }
  if (ua.webkit && document.readyState) {
    (function() {
      if (document.readyState !== 'loading') {
        init();
      } else {
        setTimeout(arguments.callee, 10);
      }
    })();
  }
  window.onload = init; // fallback
  return function(fn) { // add fn to init functions
    if (typeof fn === 'function') {
      fns[fns.length] = fn;
    }
    return fn;
  };
}();