if (navigator.mimeTypes && navigator.mimeTypes["application/x-shockwave-flash"]){
  document.write('<embed src="swf/header2.swf" wmode="window" menu="false" quality="high"');
  document.write('width="766" height="203" type="application/x-shockwave-flash"');
  document.write('pluginspage="http://www.macromedia.com/go/getflashplayer" />');
}