never enter the value in quantity more than Stock

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jQuery

Hai I am using three text boxes Item, Price, and Quantity, and one label stock , the stock are binding the value from the database. Now I need for the User never enter the value for Quantity more than Stock, below is my jquery can anyone Please tell me where I want change the Code in jquery .Below code is working fine .

$(function () {
            $("[id*=txtQuantity]").val("0");
        });
        $("[id*=txtQuantity]").live("change", function () {
            if (isNaN(parseInt($(this).val()))) {
                $(this).val('0');
            } else {
                $(this).val(parseInt($(this).val()).toString());
            }
        });
        $("[id*=txtQuantity]").live("keyup", function () {
            if (!jQuery.trim($(this).val()) == '') {
                if (!isNaN(parseFloat($(this).val()))) {
                    var row = $(this).closest("tr");
                    $("[id*=lblTotal]", row).html(parseFloat($(".price", row).html()) * parseFloat($(this).val()));
                }
            } else {
                $(this).val('');
            }
            var grandTotal = 0;
            $("[id*=lblTotal]").each(function () {
                grandTotal = grandTotal + parseFloat($(this).html());
            });
      $("[id*=lblGrandTotal]").html(grandTotal.toString());
        });