How do I do [X] questions here

[LSunday]

I'm going to save the world another "how do I do X?" thread and ask here (especially because i'm not even sure it's possible). Is there a way to make a plane active/inactive, or if not, to move it? I'm trying to create a water effect where the water appears in an area you've been in safely. I looked at the way it was done in the archive cellar, and they teleported the player into an area where it was flooded- unfortunately, that wouldn't really work for the sequence i'm putting together. Any guidlines on how to do it?

And, in other news... I've been trying to get a series of timers to work, but they keep giving me a variety of error messages based on what I change. Here's a sample of one of them (they're all almost identical):

AddTimer("Collapse1", 2.0f, "Collapse_1");
Collapse_1(Collapse1);
{
SetEntityActive("dungeon_small01_5", true);
SetEntityActive("dungeonrubble1", true);
}

The above is inside a working entity collide, if that changes anything. The error message is: "Collapse1 is not declared." However, if i put the 'string &in' back into the parenthesis, i get "expected '('" at the same position. I realize I'm probably being really stupid, but I can't find what should go in that spot.

And please no link to the wiki, because that's where I copypasta'd most of this coding from.