function doCalc() {
    var spread = FpSpread("FpSpread1");
    var colcount = spread.GetColCount();
    var total = 0;
    for (var i = 1; i < colcount - 1; i++) {
       var subtotal = parseFloat(spread.GetValue( 10,i ));
       total += subtotal;
    }
    if (!isNaN(total)) spread.SetValue(10, 0, total, true);
}