if (document.images)
  {
     pic1on= new Image(106,31);
     pic1on.src="ftp/nupp30_ro.gif";  
     pic2on= new Image(106,31);
     pic2on.src="ftp/nupp31_ro.gif";
     pic3on= new Image(106,31);
     pic3on.src="ftp/nupp32_ro.gif";
	 pic4on= new Image(106,31);
     pic4on.src="ftp/nupp33_ro.gif";

     pic1off= new Image(106,31);
     pic1off.src="ftp/nupp30.gif";
     pic2off= new Image(106,31);
     pic2off.src="ftp/nupp31.gif"; 
     pic3off= new Image(106,31);
     pic3off.src="ftp/nupp32.gif"; 
	 pic4off= new Image(106,31);
     pic4off.src="ftp/nupp33.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;
    }
 }