var requiredVersion = 5;   
var useRedirect = true;    
var flashPage   = "flash.html"    
var noFlashPage = "html/index.html"  
var upgradePage = "upgrade.html"  
var flash2Installed = false;    
var flash3Installed = false;   
var flash4Installed = false;    
var flash5Installed = false;   
var flash6Installed = false;    
var flash7Installed = false;    
var flash8Installed = false;    
var flash9Installed = false;    
var maxVersion = 9;             
var actualVersion = 0;          
var hasRightVersion = false;   
var jsVersion = 1.0;           



var isIE  = (navigator.appVersion.indexOf("MSIE") != -1) ? true : false;   
var isWin = (navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true : false; 
jsVersion = 1.1;
if(isIE && isWin){
  document.write('<SCR' + 'IPT LANGUAGE=VBScript\> \n');
  document.write('on error resume next \n');
  document.write('flash2Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.2"))) \n');
  document.write('flash3Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.3"))) \n');
  document.write('flash4Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.4"))) \n');
  document.write('flash5Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.5"))) \n');  
  document.write('flash6Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.6"))) \n');  
  document.write('flash7Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.7"))) \n');
  document.write('flash8Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.8"))) \n');
  document.write('flash9Installed = (IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.9"))) \n');
  document.write('<\/SCR' + 'IPT\> \n'); 
}

<!--
function detectFlash() {  
  if (navigator.plugins) {
    if (navigator.plugins["Shockwave Flash 2.0"]
        || navigator.plugins["Shockwave Flash"]) {
      var isVersion2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0" : "";
      var flashDescription = navigator.plugins["Shockwave Flash" + isVersion2].description;
      var flashVersion = parseInt(flashDescription.substring(16));
      flash2Installed = flashVersion == 2;    
      flash3Installed = flashVersion == 3;
      flash4Installed = flashVersion == 4;
      flash5Installed = flashVersion == 5;
      flash6Installed = flashVersion == 6;
      flash7Installed = flashVersion == 7;
      flash8Installed = flashVersion == 8;
      flash9Installed = flashVersion >= 9;
    }
  }
  for (var i = 2; i <= maxVersion; i++) {  
    if (eval("flash" + i + "Installed") == true) actualVersion = i;
  }
  if(navigator.userAgent.indexOf("WebTV") != -1) actualVersion = 4;  
  if (actualVersion >= requiredVersion) {
    if (useRedirect) {
      if(jsVersion > 1.0) {
        window.location.replace(flashPage);  
      } else {
        window.location = flashPage;
      }
    }
    hasRightVersion = true;                
  } else {  
    if (useRedirect) {
      if(jsVersion > 1.0) {
        window.location.replace((actualVersion >= 2) ? upgradePage : noFlashPage);
      } else {
        window.location = (actualVersion >= 2) ? upgradePage : noFlashPage;
      }
    }
  }
}

detectFlash();

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//-->

<!--
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->

//body here maybe

if (!useRedirect) {    
  if(hasRightVersion) {  
    var oeTags = '<OBJECT CLASSID="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"'
    + 'WIDTH="720" HEIGHT="540" ALIGN=""'
    + 'CODEBASE="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">'
    + '<PARAM NAME="MOVIE" VALUE="surf.swf">'
    + '<PARAM NAME="PLAY" VALUE="true">'
    + '<PARAM NAME="LOOP" VALUE="false">'
    + '<PARAM NAME="QUALITY" VALUE="high">'
    + '<PARAM NAME="MENU" VALUE="false">'
    + '<EMBED SRC="surf.swf"'
    + 'WIDTH="640" HEIGHT="480" ALIGN=""'
    + 'PLAY="true"'
    + 'LOOP="false"'
    + 'QUALITY="high"'
    + 'MENU="false"'
    + 'TYPE="application/x-shockwave-flash"'
    + 'PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash">'
    + '<\/EMBED>'
    + '<\/OBJECT>';

    document.write(oeTags);   
  } else {  
       var alternateContent = '<IMG SRC="images/rc-logo.jpg>' 
      + '<BR>any desired alternate html code goes here';

    document.write(alternateContent);  
  }
}