fix for FireBug "ActiveXObject is not defined"

ZeroClipboard.js

@@ -202,6 +202,9 @@
   ZeroClipboard.detectFlashSupport = function() {
     var hasFlash = false;
     try {
+      if (typeof ActiveXObject == 'undefined') {
+          throw "error";
+      }
       if (new ActiveXObject("ShockwaveFlash.ShockwaveFlash")) {
         hasFlash = true;
       }