if(document.images){
img1on=new Image();
img2on=new Image();
img1on.src="DreamHomeButton3MKM.jpg";
img2on.src="ExpertButton2MKM.jpg";
img1off=new Image();
img2off=new Image();
img1off.src="DreamHomeButton2MKM.jpg";
img2off.src="ExpertButtonMKM.jpg";
}
function imgOn(imgName) {
   if (document.images) {
      document.images[imgName].src = eval(imgName + "on.src");
      }
}
function imgOff(imgName) {
   if (document.images) {
      document.images[imgName].src = eval(imgName + "off.src");
      }
}