myH = new Array();
for (i = 0; i <= 9; i++) {myH[i] = new Image();myH[i].src = 'pic/buton' + i + '.gif';}
function butout (n) {document.images['but' + n].src = myH[n].src;}
function buton(n) {document.images['but' + n].src = 'pic/butout' + n + '.gif';}