Repeater TextBox Addition Urgent

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ASP.NET

Javascript

<asp:Repeater ID="rptIndItemsBind" runat="server">

<ItemTemplate>
                <tr>
                    <td>
                    <asp:Literal ID="ltrlItem" runat="server"  Text='<%# DataBinder.Eval(Container.DataItem,"ProductName") %>'></asp:Literal>
                    </td>
                    <td>
                        <asp:TextBox ID="txtUnit" runat="server" Width="150px" Text='<%# DataBinder.Eval(Container.DataItem,"ProductUnit") %>'></asp:TextBox>
                    </td>
                    <td>
                        <asp:TextBox ID="txtRate" runat="server" Width="150px"  Text='<%# DataBinder.Eval(Container.DataItem,"ProductRate") %>'></asp:TextBox>
                    </td>
                    <td>
                        <asp:TextBox ID="txtQuanity" runat="server" Width="150px" AutoPostBack="true" onblur="Javascript:calcu1()" ></asp:TextBox>
                    </td>                    
                </tr>
            </ItemTemplate>

</asp:Repeater>


In the above code i want multiply txtRate*txtQuantity and display in an textbox as Totalamt .

all should be done in Javascript....