but01 = new Image; but01.src = 'img/o_s.gif';
but10 = new Image; but10.src = 'img/o_s2.gif';
but02 = new Image; but02.src = 'img/co.gif';
but20 = new Image; but20.src = 'img/co2.gif';
but03 = new Image; but03.src = 'img/no.gif';
but30 = new Image; but30.src = 'img/no.gif';
but04 = new Image; but04.src = 'img/ar.gif';
but40 = new Image; but40.src = 'img/ar2.gif';

year = new Image; year.src = 'img/2003.gif';
fon_line = new Image; fon_line.src = 'img/f_l.gif';
fon_line2 = new Image; fon_line2.src = 'img/f_l2_.gif';
fon2 = new Image; fon2.src = 'img/fon2.gif';
logo = new Image; logo.src = 'img/log.gif';
log3 = new Image; log3.src = 'img/log3.gif';
mo = new Image; mo.src = 'img/mo_.gif';
st = new Image; st.src = 'img/st.gif';
fon3_2 = new Image; fon3_2.src = 'img/fon3_2.gif';
l1 = new Image; l1.src = 'img/l1.gif';
l2 = new Image; l2.src = 'img/l2.gif';
l3 = new Image; l3.src = 'img/l3.gif';
l4 = new Image; l4.src = 'img/l4.gif';
l5 = new Image; l5.src = 'img/l5.gif';
l6 = new Image; l6.src = 'img/l6.gif';

function ov(x, y)
{
document.images[x].src=eval(y+'.src');
}