[jQuery] SimpleModal containerCSS not working in Firefox or Chrome

[Bill]

Good Afternoon,

I tried to override the settings in the default stlyesheet that comes
with the simplemodal jquery plugin with containerCSS which is working
fine in IE7 but not Firefox or Chrome. Not sure if this is a bug or I
am doing something wrong.

jQuery:
    $(document).ready(function() {
        $("#ButtonPopup").click(function() {
            $("#addEditTask").modal({
                onOpen: modalOpen,
                persist: true,
                containerCss: ({ width: "300", height: "200",
marginLeft: "-150" })
            });
            return false;
        });
    });

HTML:
        <button id="ButtonPopup">Popup</button>
        <div id="addEditTask" style="display:none;">
             <p>Aliquam nonummy adipiscing augue. Lorem ipsum dolor
sit amet, consectetuer adipiscing elit.
             Maecenas porttitor congue massa. Fusce posuere, magna sed
pulvinar ultricies, purus lectus malesuada
             libero, sit amet commodo magna eros quis urna.</
p>
            <button id="ButtonSave">Save</button>
            <button id="ButtonCancel">Cancel</button>
        </div>

Please see http://beckelman.net/issues/simplemodalfirefoxproblem/default.aspx
for a working demo and zip download of the code that you can test for
yourself.

Thanks for the help in advance.

Bill