if (document.images)
   {
     pic1on= new Image(100,25);
     pic1on.src="video2.gif";  

     pic2on= new Image(100,25);
     pic2on.src="intro2.gif";  

     pic3on= new Image(100,25);
     pic3on.src="brochure2.gif";  

     pic4on= new Image(100,25);
     pic4on.src="manual2.gif";  

     pic5on= new Image(100,25);
     pic5on.src="references2.gif";  

     pic6on= new Image(100,25);
     pic6on.src="quotation2.gif";  

     pic7on= new Image(100,25);
     pic7on.src="contacts2.gif";  

     
     pic1off= new Image(100,25);
     pic1off.src="video.gif";

     pic2off= new Image(100,25);
     pic2off.src="intro.gif";   

     pic3off= new Image(100,25);
     pic3off.src="brochure.gif";   

     pic4off= new Image(100,25);
     pic4off.src="manual.gif";   

     pic5off= new Image(100,25);
     pic5off.src="references.gif";   

     pic6off= new Image(100,25);
     pic6off.src="quotation.gif";   

     pic7off= new Image(100,25);
     pic7off.src="contacts.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;
    }
 }