if (document.images){
     pic1on= new Image(145,47);
     pic1on.src="images/m1h.gif";
     pic2on= new Image(142,47);
     pic2on.src="images/m2h.gif";
     pic3on= new Image(142,47);
     pic3on.src="images/m3h.gif";
     pic4on= new Image(142,47);
     pic4on.src="images/m4h.gif";
	 picSon= new Image(142,47);
     picSon.src="images/mSh.gif";
     pic5on= new Image(142,47);
     pic5on.src="images/m5h.gif";

     pic1off= new Image(145,47);
     pic1off.src="images/m1.gif";
     pic2off= new Image(142,47);
     pic2off.src="images/m2.gif";
     pic3off= new Image(142,47);
     pic3off.src="images/m3.gif";
     pic4off= new Image(142,47);
     pic4off.src="images/m4.gif";
	 picSoff= new Image(142,47);
     picSoff.src="images/mS.gif";
     pic5off= new Image(142,47);
     pic5off.src="images/m5.gif";
   }
function lightup(imgName){
   if (document.images){
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }
function turnoff(imgName){
   if (document.images){
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }