ต้องsum auto แต่ไม่สามารถลบค่าได้ค่ามีแต่เพิ่มขึ้นครับ รบกวนช่วยที

while ($row2 = sqlsrv_fetch_array($sql2, SQLSRV_FETCH_ASSOC)){
                                                    echo ' <div class="form-group">
 $idq =   $row2['id'];
                                                    $check = '';
                                                    $check .=  "ans$idq";
                                <label for="OT" class="col-sm-2 control-label"></label>
                                <div class="radio col-sm-6"> <label>';
                                                    echo "<input type='radio' value='".$row2['score']."' id='ans$idq' name='size$idq' onchange=\"calculate(this);\"> ".$row2['ans_name']."";
                                                    echo '</label></div></div>';
                                                }

<script type="text/javascript">
    var lat="<?php echo $check; ?>";
    var lastSizeVal = 0;
    var lastquitionVal = 0;
    var lastShapeVal = 0;

    function calculate(input) {
        var total = parseInt(burgz.total_price.value);
        var value = parseInt(input.value);

        if (input.type === 'radio') {
            if (input.id === lat) {
                total -= lastSizeVal;
                lastSizeVal = value;
            }/*else if(input.id === 'ans2'){
                total -= lastquitionVal;
                lastquitionVal = value;
            }
            else {
                total -= lastShapeVal;
                lastShapeVal = value;
            }*/
        }

        if (input.checked)
            burgz.total_price.value = total + value
        else
            burgz.total_price.value = total - value;
    }

</script>