How can I have a while(www is loading) loop?

I have a

 var googlePage : WWW = WWW("http://www.google.com/");

and the code to wait until is loaded and then do stuff

 yield googlePage;
 Debug.Log("Done!");

I have a cube (It's a circular loading bar), and I want to use a while loop to change the texture (frame) every 0.5 seconds. Something like

 var frames : Texture2D[]

 function LoadGoogle(){
     var googlePage : WWW = WWW("http://www.google.com/");

     while(yield googlePage){
         //From http://wiki.unity3d.com/index.php?title=Texture_swap_animator
         var index : int = Time.time * 0.5;  //0.5 are the frames per second
         index = index % frames.Length;
         renderer.material.mainTexture = frames[index];
     }

     Debug.Log("Done!");
 }