function windowPopUp(winURL)
{
  var screenWidth  = screen.availWidth;
  var screenHeight = screen.availHeight;
  var popUpLeft    = (screenWidth-800)/1.5;
  var popUpTop     = (screenHeight-600)/2;
  var winFeatures  = "height=600,width=800,top=" + popUpTop + ",left=" + popUpLeft + ",scrollbars=yes,status=no,toolbar=no,menubar=no,location=no";
  var popUpWin     = window.open(winURL, 'mtPopUp', winFeatures);
  
  popUpWin.focus();
}