var overImages = Array ();

overImages[0] = '/images/80_bt11.gif';
overImages[1] = '/images/80_bt21.gif';
overImages[2] = '/images/80_bt31.gif';
overImages[3] = '/images/80_bt41.gif';

var offImages = Array ();

offImages[0] = '/images/80_bt10.gif';
offImages[1] = '/images/80_bt20.gif';
offImages[2] = '/images/80_bt30.gif';
offImages[3] = '/images/80_bt40.gif';