What is the difference between 判{わか}る and 分{わ}かる?


Until now, I though the only verb for "to know" was 分かる. I saw the verb 判る
used for the same meaning today.

> 判{わか}ってるから言{い}ったんだけどね。  
>  I knew that. That's why I said it.  
>  (
> _[source](http://en.touhouwiki.net/wiki/Imperishable_Night/Story/Scarlet_Team%27s_Scenario)_
> )

It has the same reading and verb conjugation, but is written with a different
Kanji. What is the difference between these two?

