if (document.images) {
   videobuttonup       = new Image();
   videobuttonup.src   = "images/button-video.png" ;
   videobuttondown     = new Image() ;
   videobuttondown.src = "images/button-video-over.png" ;
   
   gobuttonup       = new Image();
   gobuttonup.src   = "images/button-go.png" ;
   gobuttondown     = new Image() ;
   gobuttondown.src = "images/button-go-over.png" ;


   morebuttonup       = new Image();
   morebuttonup.src   = "images/button-more.jpg" ;
   morebuttondown     = new Image() ;
   morebuttondown.src = "images/button-more-over.jpg" ;


   discountsbuttonup       = new Image();
   discountsbuttonup.src   = "images/button-discounts.jpg" ;
   discountsbuttondown     = new Image() ;
   discountsbuttondown.src = "images/button-discounts-over.jpg" ;



}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}