function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

<!--

if (document.images) {
  image1on = new Image();
  image1on.src = "/images/whatson_over.jpg"; 
  image1off = new Image();
  image1off.src = "/images/whatson.jpg";
  
  image2on = new Image();
  image2on.src = "/images/feded_over.jpg";
  image2off = new Image();
  image2off.src = "/images/feded.jpg";
  
  image3on = new Image();
  image3on.src = "/images/fedtv_over.jpg";
  image3off = new Image();
  image3off.src = "/images/fedtv.jpg";

  image4on = new Image();
  image4on.src = "/images/fedcam_over.jpg";
  image4off = new Image();
  image4off.src = "/images/fedcam.jpg";

  image5on = new Image();
  image5on.src = "/images/fedmail_over.jpg";
  image5off = new Image();
  image5off.src = "/images/fedmail.jpg";
  
  image6on = new Image();
  image6on.src = "/images/HowToGetTo/GettingToFedSq_HomeTile_Rol.jpg";
  image6off = new Image();
  image6off.src = "/images/HowToGetTo/GettingToFedSq_HomeTile.jpg";
  
  image7on = new Image();
  image7on.src = "/cmsimages/follow-us-tw_Rol.jpg";
  image7off = new Image();
  image7off.src = "/cmsimages/follow-us-tw.jpg";
}

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "on.src");
  }
}

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

// -->