Javascript code not running in google chrome and IE but running in mozilla

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ASP.NET

Javascript

Hello,
I am having an problem that my javascript code runs only in an mozilla but not in google chrome and IE.please tell whould i do sothat in it can run in all major browsers..
This is search which page which open up on button on another page
<script type="text/javascript">

$(document).ready(function() {

            $('.btnSelectCSS').click(function() {
                var pmxid = $(this).attr("PMXId");
                var name = $(this).attr("FullName");
                //alert(pmxid);
                //window.opener.document.aspnetForm.ctl00_contentArea_txtlinemanager.value = pmxid;
                //var dataArray = [pmxid, pmxname];

                //                    if (window.opener) {
                //                        window.opener.returnValue = dataArray;
                //                    }
                window.returnValue = [pmxid, name];
                window.close();
            });
        });
    </script>

Below is the code behind of above page

if (selectButton != null && employee != null)
           {
               string javascript = string.Format("javascript:SelectPMxId({0},{1});", employee.PMxId, employee.FullName);

            employee.PMxId);
               selectButton.Attributes.Add("onClick", javascript);

           }

And below is the where i need to call this page..

<script type="text/javascript">
        function OpenPopup(showPopupFor) {
            var popupGenerator = null;
            var trusteeName = null;
            var empidhiddenfield = null;
            var trustnamehiddenfield = null;
            popupGenerator = document.getElementById("<%= txtlinemanager.ClientID %>");
            trusteeName = document.getElementById("<%= txtTrusteeName.ClientID %>");
            empidhiddenfield = document.getElementById("<%= textlinemangr.ClientID %>");
            trustnamehiddenfield = document.getElementById("<%= texttrustname.ClientID %>")



            if (popupGenerator == null) return false;
            var url = "masterdata/employee/employeesearch.aspx";
            var params = new Array(popupGenerator.Value);
            var popupSetting = "center:yes;scroll:no;edge=raised;status:no;resizable:no;dialogWidth:400px;dialogHeight:415px";
            var prevReturnValue = window.returnValue;
            window.returnValue = undefined;
            var pmx = window.showModalDialog(url, params, popupSetting);
            if (pmx == undefined) {
                pmx = window.returnValue;
            }
            window.returnValue = prevReturnValue;
            if (pmx == undefined || pmx == null) {
                popupGenerator.value = "";
            }
            else {
                // popupGenerator.value = pmx.toString();
                popupGenerator.value = pmx[0].toString();
                trusteeName.value = pmx[1].toString();
                empidhiddenfield.value = pmx[0].toString();
                trustnamehiddenfield.value = pmx[1].toString();
            }
            //popupGenerator.focus();
            return false;
        }

    </script>

please tell me how should i do this to work it fine..