Asset Bundle Download Crashing

Would this block of code be a problem for the Unity3D web player? And does the "streaming" button in the build settings have any affect on the web build itself?

     //  OMG No IEnumerator?! Is this safe? //
     public static void downloadAssetBundle (string url, int version)
     {
         WWW www = WWW.LoadFromCacheOrDownload(url,version);
         string keyName = url + version.ToString();
         if(dictAssetBundleRefs.ContainsKey(keyName))
         {
             return;
         }
         while(!www.isDone)
         {
             if(www.error!=null)
             {
                 throw new Exception("Something Bad Happened! " + www.error);
             }
             else
             {
                 AssetBundleRef abRef = new AssetBundleRef(url,version);
                 abRef.assetBundle = www.assetBundle;
                 dictAssetBundleRefs.Add(keyName,abRef);
             }
         }
     }