set imageurl path in hoverextendercontrol using javascript

<asp:GridView> <Columns> <asp:TemplateField HeaderText="" ItemStyle-Wrap="false"> <ItemTemplate> <asp:ImageButton ID="imgAffStatus" Width="15px" Height="15px" CausesValidation="false" OnClientClick="openAffidavitDocumentMapping(this);return false;" CommandArgument='<%#Eval("quote_id") %>' runat="server" ImageUrl="~/images/Pending-clearance_small.png"></asp:ImageButton> <asp:HiddenField ID="hdnQuote_IdNew" runat="server" Value='<%#Eval("quote_id") %>' /> <asp:HiddenField ID="hdnReadyFlg" runat="server" V ...