var objPrintWin = null;
  
  function openPrintWin( filename ) {
    var winWidth = 600;
    var winHeight = 522;
    var xPos = ( screen.availWidth - winWidth ) / 2;
    var yPos = ( screen.availHeight - winHeight ) / 2;
    objPrintWin = window.open( filename,'print','width='+winWidth+',height='+winHeight+',left='+xPos+',top='+yPos+',scrollbars=yes' );
  }
  
  function closePrintWin() {
    if( objPrintWin )
      objPrintWin.close();
  }