if ((navigator.userAgent.indexOf('iPhone') != -1) ||
(navigator.userAgent.indexOf('iPod') != -1)) 
  {
  var cssNode = document.createElement('link');
  cssNode.setAttribute('rel', 'stylesheet');
  cssNode.setAttribute('type', 'text/css');
  cssNode.setAttribute('href', '/wordpress/wp-content/themes/cultleopard/iphone.css');
  document.getElementsByTagName('head')[0].appendChild(cssNode);
  }