<!--

  if (document.images)
   {
     pic13on= new Image(170,150);
     pic13on.src="../images/colour/after.jpg"; 

     pic13off= new Image(170,150);
     pic13off.src="../images/colour/before.jpg"; 
	 
		 
	 
   }

function lightup3(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName+"on.src");
      document[imgName].src=imgOn;
    }
 }

function turnoff3(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName+"off.src");
      document[imgName].src=imgOff;
    }
 }
 //----->