jQuery and Repeater

If the user inputs a numeric value into the quantity text box, then I would like to set the price and total textboxes to "0.00"
for that row only.

Please see the screen shot, all the textboxes in all rows changed.
How can I limit it by row?

    $(document).ready(function () {
        $("[id$='_txtQuantity']").blur(function () {
            var quantity = $("[id$='_txtQuantity']").val();
            if (isNumeric(quantity)) {
                $("[id$='_txtPrice']").val('0.00');
                $("[id$='_txtTotal']").val('0.00');
            }
        });
    });

    function isNumeric(n) {
        return !isNaN(parseFloat(n)) && isFinite(n);
    }