if (document.images)
   {
     pic1on= new Image();
     pic1on.src="images/yla_hinnasto_oranssi.png";  
     pic2on= new Image();
     pic2on.src="images/yla_yhteistyo_oranssi.png"; 
	 
     pic1off= new Image();
     pic1off.src="images/yla_hinnasto.png";
     pic2off= new Image();
     pic2off.src="images/yla_yhteistyo.png"; 
	 	 
   }

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;
    }
 }