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function set_total(index){ //합계.
    var sum = 0;
    var index = index+1;
    $("#stats_tbl tbody tr:not(:last-child)").each(function() {
        var count = parseInt($(this).find("td:eq("+index+")").text());
        if (!isNaN(count)) {
            sum+= count;
        }
    });
    //console.log(index);
    return sum;
}