Action for confirmation button on user click (cancel)...

I  have a confirmation button, if the user clicks 'Cancel' the page will reset all controls.  How can I reset the page if the user's click's cancel? <asp:Button ID="btnSelected" runat="server" Text="Approve Selected" class="button white medium" Font-Bold="true" ToolTip="Approve Selected Brand Name"  OnClick="btnSelected_Click" OnClientClick="return confirm('Are you certain you want to approve the item(s)?');" />