getFlashPlayerVersion.js

(function(){
var getFlashPlayerVersion = function() {
    //[All] Flash Player is NOT installed.
    var version = 0;
    var tmp = [];
    try {
        //[IE] Flash Player is installed.
        var fo = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
        tmp = fo.GetVariable("$version").match(/([0-9]+)/);
        version = tmp[0];
    } catch (e) {
        if( navigator.mimeTypes ["application/x-shockwave-flash"] !== undefined ) {
            if( navigator.plugins && navigator.mimeTypes.length ) {
                //[Other Browser] Flash Player is installed.
                tmp = navigator.plugins["Shockwave Flash"].description.match(/([0-9]+)/);
                version = tmp[0];
            }
        }
    }
    return version;
};

var version = getFlashPlayerVersion();
if (version) {
    alert ("Flash Player v"+version+"is installed!");
} else {
    alert ("Flash Player is not installed.");
}

})();