Opening For New Window in Browser in Javascript

            var obj=window.parent.document.getElementById('DoctorListing.aspx');
             if(obj!=null)
             {
              obj.disabled=true;
             
             }
             else
             {
             alert('Close Window');
             }
window.open(url,'PopupWindow','left=50,top=50,height=400,width=800,toolbar=no,menubar=no,location=no,scrollbars=no,unadorned=yes,dialog=yes,modal=yes,directories=0,dependant=yes,resizable=no,status=yes,Fullscreen=no');