On the first one,,, how long was the URL because it would need to be a few pages long to make any progress

On the second one... i agree, i think i heard some one tell me about that not workin at some point.

On the 3rd one... (my fave)...... You couldnt of possible written all the possible scipts into an image..... there are alot of techniques to be tryed with this...
And i hope you's have noticed that i have been focusing on the web browser because i think this is the most vunerable because you are letting infomation in and there are multiple ways to do so with a web browser.

Kind Regards
Richard Bru