var pWindow; 
  var pdfName = new Object(); var pdfFile = new Object(); var pdfSize = new Object(); 

  var bWindowLeft, bWindowTop ;
  var agt    = navigator.userAgent.toLowerCase(); 
  var is_aol = (agt.indexOf("aol") != -1); 
  if (is_aol) {
    bWindowTop  = 0 ;
    bWindowLeft = 0 ;
  } else {
    bWindowTop  = 110 ;
    bWindowLeft = (screen.availWidth - 730 - 10)/2;
  }

  function pdfWindow(pdfName,pdfFile,pdfSize) {
    pwindow = window.open('../visitordetails.asp?actionURL=pdfdownload.asp','PDFwindow','height=430,width=730,top='+bWindowTop+',left='+bWindowLeft+',resizable=0,scrollbars=no,toolbars=no,status=no');
  }