if (document.images)
   {
     homeon= new Image(100,25);
     homeon.src="img/home-over.jpg";  
     homeoff= new Image(100,25);
     homeoff.src="img/home.jpg";
          
     expon= new Image(100,25);
     expon.src="img/nec-exp-over.jpg";  
     expoff= new Image(100,25);
     expoff.src="img/nec-exp.jpg";

     cmon= new Image(100,25);
     cmon.src="img/nec-com-over.jpg";  
     cmoff= new Image(100,25);
     cmoff.src="img/nec-com.jpg";

     pmon= new Image(100,25);
     pmon.src="img/programme-mgt-over.jpg";  
     pmoff= new Image(100,25);
     pmoff.src="img/programme-mgt.jpg";

     trainon= new Image(100,25);
     trainon.src="img/training-over.jpg";  
     trainoff= new Image(100,25);
     trainoff.src="img/training.jpg";
     
     contacton= new Image(100,25);
     contacton.src="img/contacts-over.jpg";  
     contactoff= new Image(100,25);
     contactoff.src="img/contacts.jpg";     

     upcomingtrainingon= new Image(129,52);
     upcomingtrainingon.src="img/upcoming-training-over.jpg";  
     upcomingtrainingoff= new Image(129,52);
     upcomingtrainingoff.src="img/upcoming-training.jpg"; 


}

function meOver(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function meOff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }