if (document.images)
   {
     pic1on= new Image(64,29);
     pic1on.src="jpg/TBH_r2_c2over.jpg";  
     pic2on= new Image(106,29);
     pic2on.src="jpg/TBH_r2_c3over.jpg"; 
     pic3on= new Image(115,29);
     pic3on.src="jpg/TBH_r2_c4over.jpg"; 
     pic4on= new Image(144,29);
     pic4on.src="jpg/TBH_r2_c5over.jpg"; 
     pic5on= new Image(73,29);
     pic5on.src="jpg/TBH_r2_c6over.jpg"; 
     

     pic1off= new Image(64,29);
     pic1off.src="jpg/TBH_r2_c2.jpg";
     pic2off= new Image(106,29);
     pic2off.src="jpg/TBH_r2_c3.jpg";
     pic3off= new Image(115,29);
     pic3off.src="jpg/TBH_r2_c4.jpg";
     pic4off= new Image(144,29);
     pic4off.src="jpg/TBH_r2_c5.jpg";
     pic5off= new Image(73,29);
     pic5off.src="jpg/TBH_r2_c6.jpg";
     
     
   }

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;
    }
 }