A Little scripting help?

I have a Couple of questions;

-I would like to place a script inside a Multiprim Object, Voice Channel activated, that will Toggle the prims from thier original colour/texture, to Invisible, and Back again.
1-A; Is this Possible with Multiple textureson a Multi Prim object?
1-B; Is such a script already available?

-I would like to place a script inside an object That, when i go into Mouselook, the object will turn to face in whatever direction I am facing in Mouselook.
I have seen something like this on ship mounted weapons systems.
2-A; Is this a custom script, or is it Commonly available?
2-B; If Commonly available, Where?

-Last question, I have seen objects set with a script that causes the object to Track with the nearest Avatars Movements, Like eyes in a Portrait Following a person as they pass.
3-A; Same question as 2-A
3-B; Same question as 2-B

Sorry, i AM a complete scripting newb, so pardon if the answers to my questions seem Obvious to you.

Thanks in advance.
Angel

1-A Yes. The bit about reverting textures makes it a bit of a pain, you'd have to have a script in each prim, because there's no llSetLinkTexture, but you can set colours and alphas by through a single script in linked objects. Depending on how fast you want the reversion you might be better with a script per prim anyway.
1-B Dunno.
2-A and 2-B Dunno. It's not hugely hard to write. Actually, I think if you find a ZX-4 helicopter, which whether or not deliberately is now a full perms freebie, there's a gun script in there that does that.
3-A and 3-B Sounds more custom, except, if you search this forum, Psyra was asking about a statue with tracking eyes recently, you might find enough of the script to make the whole thing.

If you are just making something invisible you dont need to change textures, just force the alpha. This is basically the standard show/hide functionality. Use llSetLinkSetAlpha

Items 2 and 3 would appear to be mutually exclusive?

Thank you for Lightwave Valkyrie for Giving me the scripts for questions One, and Three, Thank you Chere,, Very kind of you.

A.