​

// Modern Browsers

function detectPlugin( substrs ) {

    if (navigator.plugins) {

        for (var i = 0, l = navigator.plugins.length; i < l; i++) {

            var plugin = navigator.plugins[i],

                haystack = plugin.name + plugin.description,

                found = 0;

​

            for (var j = 0; j < substrs.length; j++) {

                if ( haystack.indexOf(substrs[j]) != -1 )   found++;

​

            }

            if ( found == substrs.length ) return true;

        }

​

    }

​

    return false;

}

​

// IE

function detectObject(progIds) {

    for (var i = 0; i < progIds.length; i++) {

        try {

            var obj = new ActiveXObject(progIds[i]);

​

          if ( obj ) return true;

​

        } catch (e) {

            // Ignore

        }

    }

​

    return false;

}

​

var detectFlash = [ "Shockwave", "Flash" ];

​

if ( detectPlugin( detectFlash ) || detectObject( detectFlash ) ) alert( 'yay' );

​

​