closing a jquery overlay

Question

Hi, So i have this:

<div id="prompt2" class="simple_overlayFondoBlanco" style="padding: 5px 5px 5px 5px">
    <asp:UpdatePanel runat="server" ID="upClausulas">
        <ContentTemplate>
         //....other controls
            <a href="#" id="lbCancelar" class="contratacionVinculos close">Cancelar</a>
        </ContentTemplate>
    </asp:UpdatePanel>
</div>

and i have this jquery function:

<script type="text/javascript">
            function pageLoad() {
                var triggers = $("button.modalInput").overlay({
                    // some expose tweaks suitable for modal dialogs
                    expose: {
                        color: '#333',
                        loadSpeed: 200,
                        opacity: 0.3,
                        zIndex: 99
                    },
                    top: '15%',
                    closeOnClick: false
                });
            }
        </script>

so the "a" is meant to close the overlay and it does good until i use one of the other controls in the div that produce postback. After that i can't get the "a" to close the overlay, only with ESC i can acomplished that.

What can i do? Thank you.