var newlinkis;
var linknumber=37;

function changelinksnow() {
if (document.getElementById('optionalCheck').checked == true) { linknumber=37; } else { linknumber=35; }
newlinkis = '<a href="http://' + linknumber + '.datingdyn.pay.clickbank.net/?cbfid=8056"><img src="/images/ggf/orange_addtocart-67.gif" border="0" /></a>';
document.getElementById('buybutton').innerHTML = newlinkis;
}