Paladin Judgements were changed some time ago. The judgement type is no longer based off of what seal you have active
Pallies have 3 Judgements now, there is no longer a single Judgement only key. Here's how it's laid out
Judgement of Light
http://www.wowhead.com/?spell=20271
Judgement of Wisdom
http://www.wowhead.com/?spell=53408
Judgement of Justice
http://www.wowhead.com/?spell=53407
They work completely independantly of what Seal is active.
EDIT: As long as you have *Any* seal active, you can cast any of these 3 judgements, but they do operate on the same global cooldown timer for the spell.