function openEditor(params) {
  var width="800", height="600";
  var left = (screen.width / 2) - width / 2; 
  var top = (screen.height / 2) - height / 2; 

  var styleStr = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+',top='+top+',screenX='+left+',screenY='+top;
  var msgWindow = window.open("../System/EditContent.aspx?" + params, "Editor", styleStr);
}