find other avatars position using llSensor

I have been trying to use the llSensor command, and make it use a string value i say, for the avatar nameit searches for, but i don't know how to tell the code to "When you hear this name, search for it", a detailed guide or example code would be useful.

integer i;
default
{
    state_entry()
    {
        llListen(0,"",llGetOwner(),"");  //listen only for you on default chat channel
    }
    listen(integer channel, string name, key id, string message)
    {
        llSensor(message,NULL_KEY,AGENT,10.0,PI);  //fire the sensor for the AV named
    }
    sensor(integer total_number)
    {
         for ( i = 0; i < total_number; i++ )    //loop through number of detected AVs
        {
            llWhisper( 0, llDetectedName(i) + " located at " + (string)llDetectedPos(i) );  //Whisper their name and coordinates
        }
    }
}

uncompiled but mostly cut and pasted from the wiki so ought to compile

Secondlife Wiki

L8r,
UU

where abouts in the site did you find this? Also, this doesn't work, i get type mismatches in the lldetectedname and pos.

sorry, forgot to declare my variables, add:

integer i;

before the default line

did that in both my responses today.
will check here in a second after the new update downloads

L8r,
UU


edit: oh, whoops, forgot to cast detectedpos as a string too... original post is edited to a fully functioning script now

Need to change this too:

llWhisper( 0, llDetectedName(i) + " located at " + (string)llDetectedPos(i) );

THank you, i can't describe how much this has helped my understanding of llSensor .