/**
* function to popup a window
*
* @param  string the url for popup window
* @param  string the title for window
* @param  int    the width of window
* @param  int    the height of window
* @return void
*/
function non_popUpWindow(url, title, width, height) {
  var nwl=(screen.width) ? (screen.width-width)/2 : 0;
  var nwh=(screen.height) ? (screen.height-height)/2 : 0;
  opt = 'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,copyhistory=0,width=' + width + ',height=' + height + ',left=' + nwl + ',top=' + nwh;
  fenster = window.open(url, title, opt);
  fenster.focus();
}