var popupWin = null;
 var agt=navigator.userAgent.toLowerCase();
 var is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));
 var is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
 var is_winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
 var is_win32 = (is_win95 || is_winnt || is_win98 || ((is_major >= 4) && (navigator.platform == "Win32")) || (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

function openWindow(url)
 {
  popupWin = null;
  popupWin = window.open(url, 'perpop', 'scrollbars,width=550,height=400,left=0,top=0');
  window.name = 'persec';
   popupWin.focus();
  }

function chekwin()
 {
  if (popupWin != null && !popupWin.closed)
   popupWin.close();
 }