var down = new Image();
 down.src = "toplinkdown.gif";
 
 var up = new Image();
 up.src = "toplinkup.gif";
 
 var down2 = new Image();
 down2.src = "sidelinkdown.jpg";
 
 var up2 = new Image();
 up2.src = "sidelinkup.jpg";
 
 var down3 = new Image();
 down3.src = "hsidelinkdown.jpg";
 
 var up3 = new Image();
 up3.src = "hsidelinkup.jpg";