Originally Posted by
pansonic
Google Cache my friend
Start out on normal mode, talk to thrall to get the chat window open to start the encounter, and leave it open. Then right click your portrait and open up the raid difficulty tab, then hit one of these macros:
10 Man:
Code:
/click StaticPopup1Button1
/click DropDownList2Button3
25 Man:
Code:
/click StaticPopup1Button1
/click DropDownList2Button4
It'll switch the difficulty right as it starts the encounter. This should work with any other bosses which are engaged via a dialog npc.