function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function require(libraryName) {
  // inserting via DOM fails in Safari 2.0, so brute force approach
  document.write('<script type="text/javascript" src="/javascripts/'+libraryName+'"></script>'); 
}