It's quite simple, you just have to put the [img] tags inside the [url]s. Like so:
The code for that is
[url=http://scratch.mit.edu/forums/viewtopic.php?id=73499][img]https://lh6.googleusercontent.com/-EfANv1eoX0s/TnvcRfcBnkI/AAAAAAAADYc/u3MHZSEbwNM/jacuzieinc1.gif[/img][/url]
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Oh, you just had it reversed... You were close.
If you ever want to learn HTML you should learn that by having a image around a link does nothing, because the image will have the url tag inside it.
But since the url tag allows you to go [url=...] then you can put anything bbcode except for quotes and codes. even smilies though!
(by the way, it's BBCode. Don't initial it BBC because that's the name of a news channel or something in Britain.)
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