freezing the player's movements

Yeah I'm pretty dumb when it comes to simple scripts, but how do I stop a player from running around like a chicken with its head cut off during conversations and then making him move again when they stop talking?

SetPlayerProperty and PROP_TOTALLYFROZEN

to be precice:

SetPlayerProperty(0,1,0); //this freezes the player but lets him still look around
... //your conversation here
SetPlayerProperty(0,0,0);//this re-enables the player to walk

of course these only work for the calling player,if you were to stop all players from running around,you'd use

SetPlayerProperty(1,1,0);