Javascript Confirmation Message on Deletion

<script type="text/javascript">
    function Confirmation()
    {
        var answer = confirm("Are You Sure to want to delete?");
        if (answer)
        {
            return true;
            alert("Deleted Successfully");
        }
        else
        {
            return false;
        }
        return false;
    }
</script>

<asp:LinkButton ID="lbtn_Delete"  OnClientClick="return Confirmation();" CssClass="Details" style="text-decoration:none" runat="server" Text="Delete" CommandName="Delete" CommandArgument='<%#Eval("Clipping_Id") %>'></asp:LinkButton>