function check_browser()
{
  var version_number = navigator.appVersion.charAt(0);

  if (navigator.appName.indexOf("Netscape") != -1)
  {
    if (version_number < 3)
    {
      return false;
    }
    return true;
  }

  if (navigator.appName.indexOf("Explorer") != -1)
  {
    if (version_number < 4)
    {
      return false;
    }
    return true;
  }

  // unknown
  return false;
}


  if (check_browser()) 
{  
  <!--menu-->

  
  HEAD10 = new Image(50,20);
  HEAD11 = new Image(50,20);
  HEAD12 = new Image(50,20);
  HEAD13 = new Image(50,20);
  HEAD14 = new Image(50,20);
  HEAD15 = new Image(50,20);
  HEAD16 = new Image(50,20);

  
  HEAD10on = new Image(50,20);
  HEAD11on = new Image(50,20);
  HEAD12on = new Image(50,20);
  HEAD13on = new Image(50,20);
  HEAD14on = new Image(50,20);
  HEAD15on = new Image(50,20);
  HEAD16on = new Image(50,20);


  BLANK = new Image(118,13);



  HEAD10.src = "img/nav/home.gif";
HEAD11.src = "img/nav/message.gif";
  HEAD12.src = "img/nav/activity.gif";
  HEAD13.src = "img/nav/schedule.gif";
   HEAD14.src = "img/nav/link.gif";
   HEAD15.src = "img/nav/application.gif";
  HEAD16.src = "img/nav/member.gif";

  
  HEAD10on.src = "img/nav/homeD.gif";
  HEAD11on.src = "img/nav/messageD.gif";
  HEAD12on.src = "img/nav/activityD.gif";
  HEAD13on.src = "img/nav/scheduleD.gif";
  HEAD14on.src = "img/nav/linkD.gif";
  HEAD15on.src = "img/nav/applicationD.gif";
  HEAD16on.src = "img/nav/memberD.gif";


 

  BLANK.src = "images/blank.gif"
}