If you're sitting somewhere ...

Okay. I'm making a script that changes the color of three of the prims on a vehicle I'm making, and the actual vehicle script (a free "Motorcycle" script someone gave me that I've modified slightly) isn't on one of the scripts with the color change. You get it to change by saying "/color (name of color)", and the problem is, I can't for the life of me figure out how to make it only work if you're driving it. Anyone got any suggestions?

As a vehicle, it probably has a llSitTarget call somewhere, right? If not, add this in default state_entry:

llSitTarget(<0, 0, 0.001>, ZERO_ROTATION);

Then look here for the answer to your question:
http://secondlife.com/badgeo/wakka.php?wakka=llAvatarOnSitTarget

Okay ... hmm ... is there any variable or whatever to call if you want to know the name of who's riding it, or something? (So I can filter the name in the llListen() statement)

EDIT: Okay, I put:

        if (change & CHANGED_LINK) {
            if (llAvatarOnSitTarget() != NULL_KEY) {

before the listen() bit and } } after it, but that doesn't seem to work ...

The following will return a string containing the name of the avatar sitting on the scripted object.

string sitter = llKey2Name( llAvatarOnSitTarget() ) ;

llAvatarOnSitTarget() will return NULL_KEY if nobody's sitting on the object.

might want to make it so it only listens when somebody's sitting on it and turns the listen off when they get up. since you want it to work only when somebody's on it there's no sense having it listen when they're not on it.

Okay ... can strings and whatnot pass through different script items in different prims on the same object? And Zuzi, that's kinda what I'm trying to do. n.n;

Yes. Use link messages.

Here's a modified version of code with a dynamic listener and llDialog. It's just a simplified version of my single-prim media script:

integer g_listener = FALSE; // Listen Handler
integer randomChannel = 0; // Our random channel
default
{
    state_entry()
    {
        // Non-Zero Sit Target REQUIRED for llAvatarOnSitTarget()!
        llSitTarget(<0,0,1>,<0,0,0,1>);
    }

    changed(integer change)
    {
        if(change & CHANGED_LINK)
        {
            key agent = llAvatarOnSitTarget();
            if(agent)
            {
                llListenRemove(g_listener);
                randomChannel = 10 + (integer)llFrand(100000);
                g_listener = llListen(randomChannel,"",agent,"");
                llSetTimerEvent(20.0);
                llDialog(agent,"Select an option:",["Play","Pause","Stop","Loop"],randomChannel);
            }
        }
    }
    listen(integer chan, string name, key id, string msg)
    {
        if(chan == randomChannel)
        {
            if(msg == "Play")
                llSay(0,"User Said 'Play'");
            else if(msg == "Stop")
                llSay(0,"User Said 'Stop'");
            else if(msg == "Pause")
                llSay(0,"User Said 'Pause'");
            else if(msg == "Loop")
                llSay(0,"User Said 'Loop'");
            llListenRemove(g_listener);
        }
    } 
    timer() 
    {
        llSetTimerEvent(0.0);
        llListenRemove(g_listener);
    }
}

Hmm ... how do you detect what an object's link number is?

Okay ... how do you send a link message between different prims linked to the same object?

Use their link number.

Ah, figured it out! ^^

I wish...A global variable at this level would be quite relieving. Well, more likely for single prims, but I certainly wouldnt' mind. =D

Wouldn't necessarily make the code itself more efficient, but would make the CODER so