[jQuery] slideUp doesn't occur

[Nitin Sawant]

Hello,
      I wrote following code for slide-up and slide-down animation of
div tag,

javascript:

$("#patientdvTop1").click( function() {
                            if ($("#patientopenCloseIdentifier1").is
(":hidden")) {
                                $("#patientdvContent1").slideDown
("fast");
                                $(this).css({'background-image' : 'url
("images/LeftBar/mainTopOver.png")'});
                                $("#patientopenCloseIdentifier1").show
();
                            }else{
                                $("#patientopenCloseIdentifier1").hide
();
                                $(this).css({'background-image' : 'url
("images/LeftBar/mainTopNormal.PNG")'});
                                $("#patientdvContent1").slideUp
("fast");
                            }
});

html:
<div id="patientopenCloseIdentifier1"></div>
                        <div id="patientdvTop1">
                            <table width="100%" height="100%">
                                <tr>
                                    <td align="center">
                                        <font face="trebuchet ms"
color="darkblue"><b>Patient Registration</b></font>
                                    </td>
                                </tr>
                            </table>
                        </div>
                        <div id="patientdvContent1">
                            <center>
                                    <table cellpadding="8">
                                        <tr>
                                            <td align="left">
                                                       Hello There
                                            </td>
                                        </tr>
                                    </table>
                            </center>
                        </div>
<div id="patientdvBottom1"></div>

above code works fine in all versions of internet explorer,

but in Firefox,Google Chrome and Opera - just the Slidedown event
occurs, slideup never happens pls help ..

regards,
Nitin Sawant