var newtu
var isNav = (navigator.appName == "Netscape") ? true : false
var isFive=(isNav && (navigator.appVersion.charAt(0) >= 5)) ? true : false
var isMac = (navigator.appVersion.indexOf("Mac") != -1) ? true : false
function getlinks() {
  if(!newtu||newtu.closed)
  newtu=window.open('b.html','Links','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width=335,height=290');
  newtu.focus()
}
document.write('<a href="javascript:getlinks()">Links</a>')