basic hide/show script help needed

This script does the job i need it to do perfectly, however,the build i am currently using it in requires multiple prims within the same item to use the script at the same time, using opposite commands.

ie, i want some prims to disappear and some to appear using one command and the reverse with the opposite command, this works perfectly until i link the object.... how do i alter this script to make each prim listen for the command and not make the whole build appear and dissappear?

thankyou

heres the script

default
{
state_entry()
{
llListen(0,"","","";
}

on_rez(integer param)
{
llResetScript();
}

listen(integer c, string n, key k, string m)
{
if(m=="Rest" llSetLinkAlpha(LINK_SET,1.0,ALL_SIDES);
else if (m=="Wake" llSetLinkAlpha(LINK_SET,0.0,ALL_SIDES);
}
}

Put the script in each prim to (dis)appear. Not in the rootprim.
Then change the lines in the listen event to:

if (llToLower(m) == "rest" llSetAlpha(1.0, ALL_SIDES);
else if (llToLower(m) == "wake" llSetAlpha(0.0, ALL_SIDES);

Swap 'rest' and 'wake' to make it work the other way around.

A considerably less laggy way of doing it than having a separate listen in each prim would be to put something like this in one prim:

default
{
    state_entry()
    {
        llListen(5, "", llGetOwner(), "");
    }

    listen(integer channel, string name, key id, string message)
    {
        string str = message;
//  if (llToLower(str) == "show")   uncomment if you want to show/hide the listening prim
//        {
 //           llSetAlpha(1.0, ALL_SIDES);
//        }
  //      else if (llToLower(str) == "hide")
  //      {
 //           llSetAlpha(0.0, ALL_SIDES);
 //       }
       llMessageLinked(LINK_SET, 0, str,  id);
    }
}

and this in each prim in the linkset you want to show or hide:

default
{
    

    link_message(integer sender_num, integer num, string str, key id)
    {
        if (llToLower(str) == "show")
        {
            llSetAlpha(1.0, ALL_SIDES);
        }
        else if (llToLower(str) == "hide")
        {
            llSetAlpha(0.0, ALL_SIDES);
        }
    }
}

AFTERTHOUGHT

Perhaps a better way of doing it, since we're only deciding once what to do? Does this affect performance? Anyway:

default
{
    state_entry()
    {
         llListen(5, "", llGetOwner(), "");
    }

    listen(integer channel, string name, key id, string message)
    {
        string  str = message;
        float myAlpha;
if (llToLower(str) != "show" && llToLower(str) != "hide" ) 
return;
 if (llToLower(str) == "show") 
 myAlpha = 1.0;
 if (llToLower(str) == "hide") 
 myAlpha = 0.0;
  
 llMessageLinked(LINK_SET, 0, (string)myAlpha,  id);
//llSetAlpha(myAlpha, ALL_SIDES); uncomment if you want to change this prim
       
    }
}

and

default
{
   

   link_message(integer sender_num, integer num, string str, key id)
    {
       llSetAlpha((float)str, ALL_SIDES);
    }
}

in the other linked prims you want to change.