Life In 19x19

I'm a pretty casual young go player, mostly blitz these days, around fifth kyu. I haven't been playing too long and I've just come across the attached SGF, or something similar to it. What's the best way to handle it assuming the surrounding circumstances are open.

For those who don't want to open up an SGF file just to see a joseki:

Click Here To Show Diagram Code

[go]$$B Black to play
$$ ------------------
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . 3 . 2 . . .
$$ | . . . 1 . . . . .
$$ | . . . . . . . . .
$$ | . . 4 . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]

Thanks man, I didn't know how to do that

I think 3 is usually a mistake unless black has a stone on or around at least one of the side star points. I think 4 is usually a mistake unless 3 was a mistake (white *should* end up with two groups now).

That said, this position does appear occasionally in professional play:

That's man... and that josekipedia looks awesome, thanks