if (document.images) {
   recordingson=new Image();
   recordingson.src="assets/navbar/on-recordings.jpg";
   recordingsoff=new Image();
   recordingsoff.src="assets/navbar/off-recordings.jpg";
   performanceson=new Image();
   performanceson.src="assets/navbar/on-performances.jpg";
   performancesoff=new Image();
   performancesoff.src="assets/navbar/off-performances.jpg";
   compositionon=new Image();
   compositionon.src="assets/navbar/on-composition.jpg";
   compositionoff=new Image();
   compositionoff.src="assets/navbar/off-composition.jpg";
   publicationson=new Image();
   publicationson.src="assets/navbar/on-publications.jpg";
   publicationsoff=new Image();
   publicationsoff.src="assets/navbar/off-publications.jpg";
   bioon=new Image();
   bioon.src="assets/navbar/on-bio.jpg";
   biooff=new Image();
   biooff.src="assets/navbar/off-bio.jpg";
   homeon=new Image();
   homeon.src="assets/img/home-on.gif";
   homeoff=new Image();
   homeoff.src="assets/img/home-off.gif";
  }

  function navbarOn(navbarName) {
    if (document.images) {
     document[navbarName].src=eval(navbarName + "on.src"); 
     document.write = "HELLO?";
    }
  }

  function navbarOff(navbarName) {
    if (document.images) {
     document[navbarName].src=eval(navbarName + "off.src");
    }
  }