function browserIsSupported()
{
  var agent = navigator.userAgent.toLowerCase();
  var major = parseInt(navigator.appVersion);
  var minor = parseFloat(navigator.appVersion);

  var isOpera = agent.indexOf("opera") != -1;
  var isIe = !isOpera && ( agent.indexOf("msie") != -1 );
  var isIe3 = isIe && ( major < 4 ) && ( agent.indexOf("msie 6") == -1 );
  var isIe4 = isIe && ( major == 4 ) && ( agent.indexOf("msie 4") != -1 );
  var isIe5Up = isIe && !isIe3 && !isIe4;

  return isIe5Up;
}


function verifyBrowser()
{
  var ie = browserIsSupported();
  if ( !ie ) {
    var cluster = getCluster( "www" );
    window.location = cluster + "help/browser.html";
  }
}