how to call javascript onload?

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ASP.NET

Javascript

Gridview

I have a java script function which help to calculate the total cost by taking the price * by the quality

<script type="text/javascript">

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

                   });

    </script>

however when load the default.aspx, the txtQuality will retrieve a count value from the database table , but how the javascript will work if only the table value is change, **but beside that i also want to have a result that when default.aspx is load, the "lblTotal" have a amount calculate by the javascript by using the count value * price**

Protected Sub GridView1_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
            If e.Row.RowType = DataControlRowType.DataRow Then


                Dim txt As TextBox = DirectCast(e.Row.FindControl("txtQuality"), TextBox)
                Dim adapter As New SqlDataAdapter
                Dim ds As New DataSet
                'Dim sql As String

                Dim connectionString = ConfigurationManager.ConnectionStrings("ProjData").ConnectionString
                Dim myConn As New SqlConnection(connectionString)

                Dim cmd = "Select * From Product Where customerID='" & Session("customerID") & "' "

                ' Dim myCmd As New SqlCommand(cmd, myConn)

                Try
                    myConn.Open()
                    Dim myCmd As New SqlCommand(cmd, myConn)
                    adapter.SelectCommand = myCmd
                    adapter.Fill(ds, "Product")
                    adapter.Dispose()
                    myCmd.Dispose()
                    txt.Text = ds.Tables(0).Rows.Count



                Catch ex As Exception
                    MsgBox("Can not open connection ! ")
                End Try
            End If
        End Sub

<ItemTemplate>


     <table style="width: 79%; height: 31px;">
                        <tr>
                            <td class="style1">
                                <asp:Label ID="Label7" runat="server" Text="price    $"></asp:Label>
                            </td>
                            <td >
                                <asp:Label ID="price" runat="server" Text='<%# Bind("costPerTable") %>' ></asp:Label>

                        </td>
                    </tr>
                    <tr>
                        <td class="style1">
                            <asp:Label ID="Label2" runat="server" Text="Quantity"></asp:Label>
                        </td>
                        <td>
                            <asp:TextBox ID="txtQuantity" runat="server"></asp:TextBox>
                        </td>
                    </tr>

                    <tr>
                        <td class="style1">
                            <asp:Label ID="Label8" runat="server" Text="Total Cost:"></asp:Label>
                        </td>
                        <td>
                            $<asp:Label ID="lblTotal" runat="server" ></asp:Label>
                        </td>
                    </tr>

                </table>
            </ItemTemplate>

        </asp:TemplateField>