POPUP window issue on IE

function OpenChildWindow(value,pagename)
        {
            //open a new dialog window
            try
            {
            var sFeatures="dialogHeight: 500px;";
            sFeatures += "titlebar :no";
            sFeatures += "dialogWidth: 600px;";
            sFeatures += "right: yes;";
            sFeatures += "edge: sunken;";
            sFeatures += "scroll: no;";
            sFeatures += "status: yes;";
            sFeatures += "resizeable: no;";
          
            var url = "conntrolsetting.aspx?";
            url += "SomeValue=" + value + "&";
            url += "spage=" + pagename;

            entryWindow=window.showModalDialog(url,'ChildForm',sFeatures);


            if(entryWindow ==true)
            {

                //this would trigger the update panels update as the button is part of the UP
                window.document.getElementById('btnHiddenForUpdate').click();
            }
            else
            {
                //No change will happen to the parent page as child page did nothing

                window.document.getElementById('btnHiddenForUpdate').click();
            }
            }
            catch(e)
            {
            }
        }