Picture Changer Script Help Needed

Hi-
I am trying to make a picture changer that:
1: works with both direction prims (Next) and (Prev) and chat commands /1Next, /1Prev
2: will utlimately only respond to people in the group the object is set to

I haven't gotten to the 2nd part yet, but I am stumped on the whole listen thing, primarily because I just am dense when it comes to understanding where things should be placed (among other faults of my programming skills).

I am using an existing script and trying to modify it. The error I have been getting so far is:

(76,15) : ERROR: Name not defined within scope

I would appreciate any direction anyone can give.

Thank you.
Dmitriy

// TWO-BUTTON TEXTURE VENDOR
// Origional script by Thili Playfair
// Heavily Modified by Karandas Banjo
// Tiny alter by Maxwell Harmison (just so I can put my name in it...lol)
// Please include these names if you modify or
// re-distribute this code ^_^

string objname;
integer total;
integer counter;
integer change;


next()
{
    total=llGetInventoryNumber(INVENTORY_TEXTURE);
    objname = llGetObjectName();
    counter++;
    if(counter>=total)
    {
        counter=0;
    }
    llSetTexture(llGetInventoryName(INVENTORY_TEXTURE,      counter),4);
}
prev()
{
    total=llGetInventoryNumber(INVENTORY_TEXTURE);
    objname = llGetObjectName();
    if (counter > 0)
    {
        counter--;
    }
    else
    {
        counter=total - 1;
    }
    llSetTexture(llGetInventoryName(INVENTORY_TEXTURE,      counter),4);    
}

default
{
    state_entry()
    {        
        next();
        llSetTimerEvent(0);
        llListen(1, "", llGetOwner(), "");
   
    }
    listen(integer channel, string name, key id, string msg)
    {
    }
    touch_start(integer total_number)
    
    {    

       if (msg == "/1next")
       {
           next();
       }
       else if ( llGetLinkName(llDetectedLinkNumber(0)) == "next" )
        {
            next();
        }
        else if ( llGetLinkName(llDetectedLinkNumber(0)) == "prev" )
        {
            prev();
        }
    }
        
    timer()
    {
        next();
    }
    on_rez(integer start_param)
    {
        llResetScript();
    }
} 
CODE

You seem to have put your listen logic into your touch_start event handler, where msg isn't in scope.

Thank you. It works now.