var browserGood = 0;
  var ang = 100;
  var l1x = 100;
  var l2x = 600;
  var lightDir = 0;

  if (navigator.userAgent.indexOf("MSIE")    != -1 && 
    navigator.userAgent.indexOf("Windows") != -1 && 
    navigator.appVersion.substring(0,1) > 3)
  { browserGood = 1; }

  function lightsOn(ambLight) {
    if (browserGood == 1) {
      ambLight += 10;
      document.all.missionTxt.style.filter = "light";
      light = document.all.missionTxt.filters[0];
      light.Clear();
      if (ambLight < 200) {
        light.addAmbient(255,255,255,ambLight);
        window.setTimeout("lightsOn(" + ambLight + ")",2);
      } else {
        light.addAmbient(255,255,255,255);
      }
    }
  }    

  function spotLights() {
    if (browserGood == 1) {
      document.all.missionTxt.style.filter = "light";
      light = document.all.missionTxt.filters[0];
      light.Clear();
      light.addAmbient(255,255,255,50);
      light.addCone (l1x,70,100,l1x,70,  255,255,255,  255,25);
      light.addCone (l2x,150,100,l2x,150,  255,255,255,  255,25);
      if (lightDir == 0)
      {
        l1x += 25;
        l2x -= 25;
      } else {
        l1x -= 25;
        l2x += 25;
      }
      if (l1x >= 550)
        lightDir = 1;
      if (l1x <= 100) {
        window.setTimeout ("lightsOn(30);",1000);
      } else {
        window.setTimeout ("spotLights();",32);
      }
    }
  }

  function sineAnim() {
    ang-=5;
    if (ang < 0)
      ang = 95;
    document.all.header.style.filter = "wave(add=1,freq=3,phase=" + ang + ",strength=5)";
    window.setTimeout("sineAnim();",64);
  }

  function changeColour(objPtr, textColor)
  {
    if(browserGood == 1)
      objPtr.style.color = textColor;
  }

  function changeImage(imgName, imgFile)
  {
    document[imgName].src = imgFile;
  }

  function changeFontWeight(objPtr, fWeight)
  {
    if(browserGood == 1)
      objPtr.style.fontWeight = fWeight;
  }