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validate the selection of atleast one checkbox in the gridview using javascript

Posted By:      Posted Date: August 26, 2010    Points: 0   Category :ASP.Net

 i have a gridview with a checkbox in the templatefield as given  below,

<asp:GridView runat="server" ID="gvAsgnHw"  AutoGenerateColumns="False"   >
        <asp:CheckBox id="cbAsgnHwGrid"   runat="server" /> </ItemTemplate></asp:TemplateField>

         <asp:BoundField DataField="Resource_id" HeaderText="Resource ID"/>
        <asp:BoundField DataField="Resource_name" HeaderText="Hardware Name" />

I want to check the selection of atleast one checkbox on a button click using javascript.
pls help

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