var myFlash = (function(){
  if(typeof window.ActiveXObject != "undefined"){
    return new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
  }else{
    return navigator.plugins['Shockwave Flash'];
  }
})();

<script>
      (function(){ 
        var getFlashVersion = function() { 
        try { 
            if(typeof window.ActiveXObject != 'undefined') {
               return parseInt((new ActiveXObject('ShockwaveFlash.ShockwaveFlash')).GetVariable("$version").split(" ")[1].split(",")[0], 10); 
             }else{
              return parseInt(navigator.plugins["Shockwave Flash"].description.split(' ')[2], 10);
             }
          } catch(e){
            return 0;
          }
        };
        console.log(getFlashVersion());
      })();

 </script>