divid.visible= true not working in clientside javascript

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I have update panel and inside update panel common div for all the code.I want to hide and show div from client side javascript but getting an error

Failed to load resource: net::ERR_CACHE_MISS

on error page click error shows in the below code

<script>(function() {with (this[2]) {with (this[1]) {with (this[0]) {return function(event) {javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("ctl00$MainContent$ViewPatient$btnViewPatient", "", true, "", "", false, false))
};}}}})</script>

below is java script called function that is called from code behind method

<script type="text/javascript">
    var $ = jQuery.noConflict();
    function SetPatientVisibleTrue(obj) {
        debugger;
        $('#MainContent_AddPatient_DvPatient').show();
        $('#<%=successmessage.ClientID%>').hide();

        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
        function EndRequestHandler(sender, args) {

            debugger;
            $('#MainContent_AddPatient_DvPatient').show();
            $('#<%=successmessage.ClientID%>').hide(); 
        }

    };
</script>