function openPopUp(url)
{
  var width  = 740;
  var height = 537;
  var left   = (screen.width  - width)/2;
  var top    = (screen.height - height)/2;
  var params = 'width='+width+', height='+height;
  params += ', top='+top+', left='+left;
  params += ', directories=no';
  params += ', location=no';
  params += ', menubar=no';
  params += ', resizable=no';
  params += ', scrollbars=no';
  params += ', status=no';
  params += ', toolbar=no';
  newwin=window.open(url,'windowname5', params);
}