Javascript Detect Browser

dataget = navigator.userAgent;
getBrowser();

 

function getBrowser(){

 

 if(dataget.indexOf("Edge/") != -1){
  name = "Microsoft Edge";
  Version = "Microsoft Windows 10";
  writeDetail(name, Version);
 }
 else if(dataget.indexOf("Lunascape") != -1){
 /*
 LunaScape have 3 engin.
 1. is MSIE
 2. is Gecko
 3. Webkit
 
 But "Gecko" and "Webkit" almost the same user agent.
 So, that two Engin aloso use the same if() function.
 
 */
  function lunaEngin(){
   if(dataget.indexOf("MSIE") != -1){
    arrName = dataget.split("Lunascape");
    Version_Number = parseFloat(arrName[1]);
   }else{
    arrName = dataget.split("Lunascape/");
    Version_Number = parseFloat(arrName[1]);
   }
   return Version_Number;
  }
  
  name = "Lunascape";
  Version = lunaEngin();
  
  writeDetail(name, Version);
 
 }
 else if(dataget.indexOf("Maxthon") != -1){
  name = "Maxthon";
  arrName = dataget.split("Maxthon/");
  Version = parseFloat(arrName[1]);
  writeDetail(name, Version);
 }
    else if(dataget.indexOf("Opera") != -1)
    {
        keyword = "Opera Mini/";
        if(dataget.indexOf(keyword) != -1)
        {
            arrName = dataget.split(keyword);
            Version = parseFloat(arrName[1]);
            name = "Opera Mini";
            writeDetail(name, Version);
        }else{
            keyword = "Version/";
            arrName = dataget.split(keyword);
            Version = parseFloat(arrName[1]);
            name = "Opera";
            writeDetail(name, Version);
        }
           
    }
    else if(dataget.indexOf("RockMelt") != -1)
    {
        arrName = dataget.split("RockMelt/");
        Version = parseFloat(arrName[1]);
        name = "RockMelt Social Browser";
        writeDetail(name, Version);   
    }
    else if(dataget.indexOf("Chrome/") != -1)
    {
        if(dataget.indexOf("Android") != -1)
        {
                document.write('<p>Google Chrome for Android</p>');
        }else{
                arrName = dataget.split("Chrome/");
                Version = parseFloat(arrName[1]);
                name = "Chrome";
                writeDetail(name, Version);
        }
       
    }
    else if(dataget.indexOf("Mozilla/") != -1)//Loop for Mozilla Firefox, IE11, IE10-
    {
        if(dataget.indexOf("rv:") != -1){
   
   if(dataget.indexOf("Firefox/") != -1){
    if(dataget.indexOf("Android") != -1){
     document.write('<p>Firefox for Android</p>');      
    }else if (dataget.indexOf("Firefox/") != -1){
     arrName = dataget.split("Firefox/");
     Version = parseFloat(arrName[1]);
     name = "Firefox";
     writeDetail(name, Version);
    }
   }else{      
    arrName = dataget.split("rv:");
    Version = parseFloat(arrName[1]);
    name = "Microsoft Internet Explorer";
    writeDetail(name, Version);
   }
  }
  else if(dataget.indexOf("MSIE") != -1){
   name = "Microsoft Internet Explorer";
   arrName = dataget.split("MSIE");
   Version = parseFloat(arrName[1]);

 

   if(Version >= 8)
   {
    writeDetail(name, Version);
   }
   else
   {
    document.write('<p><b>You still using old Version of Internet Explorer Please Up Grade now for better performance.</b></br>');
    document.write("<a href='http://www.ieaddons.com/en/'>Click Here to Download New Version of Internet Explorer!</a>");   
    //window.close();
   }               

 

   
  } 
    }
    else if(dataget.indexOf("Android") != -1)
    {
        arrName = dataget.split("Android");
        Version = parseFloat(arrName[1]);
        name = "Android";
        writeDetail(name, Version);
    }
    else if(dataget.indexOf("Safari") != -1)
    {   
                if(dataget.indexOf("iPad") != -1){
        document.write('<p>You access from iPad</p>');
        }
        if(dataget.indexOf("iPod") != -1){
        document.write('<p>You access from iPod</p>');
        }
        else if(dataget.indexOf("iPhone") != -1){
        document.write('<p>You access from iPhone</p>');
        }
        else if(dataget.indexOf("Version/") != -1)
        {
        arrName = dataget.split("Version/");
        Version = parseFloat(arrName[1]);
        name = "Safari";
        writeDetail(name, Version);
        }
               
    }
    else if(dataget.indexOf("NanohaBrowser/") != -1)
    {
        arrName = dataget.split("NanohaBrowser/");
        Version = parseFloat(arrName[1]);
        name = "Nanoha Browser";
        writeDetail(name, Version);
    }
        else if(dataget.indexOf("Bada/") != -1)
    {
        arrName = dataget.split("Bada/");
        Version = parseFloat(arrName[1]);
        name = "Bada";
        writeDetail(name, Version);
    }
       
}

 

function writeDetail(browsName, browsVer){
 document.write('<p>Now you use <b>' + browsName + '</b> Version <b>' + browsVer +'</b></p>');
}