function re(s) {
        var r="";
        for (var i=0;i<s.length;i++)
        if (s.charAt(i)==",")
                r=r+".";
        else
                r=r+s.charAt(i);
        var v=parseFloat(r);
        if (isNaN(v)) v=0;
        return v;
}
function Conv(a)
{
        a.answer.value=re(a.amount.value)*a.sell.options[a.sell.selectedIndex].value / a.buy.options[a.buy.selectedIndex].value;
}
function Conv1(a)
{
        a.amount.value=re(a.answer.value)*a.buy.options[a.buy.selectedIndex].value / a.sell.options[a.sell.selectedIndex].value;
}