function imgOn(imgName)  {
      if (document.images)  
          document[imgName].src = eval(imgName + "on.src");
      }
  function imgOff(imgName)  {
      if (document.images)  
          document[imgName].src = eval(imgName + "off.src");
      }
  function openWindow(name,w,h) { 
      window.open("",name,'toolbar=0,location=0,scrollbars=0,width=' + w + ',height=' + h + ',resizable=0,left=10,top=10'); 
  }