Simple Stove Fire Script problem

Hello All,

I'm only on day two of scripting so still working on basics. Can't get my head around the following problem. Trying to build a stove fire triggered by touch using a cylinder prim. The following script makes the fire go on and off, but the top and bottom of the cylinder do not go transparent in either state - in my limited knowledge, the llSetAlpha(100.0, ALL_SIDES) should have accomplished this but apparently not. Here it is:

default
{
    on_rez(integer start_param)
    {
        llSetAlpha(100.0, ALL_SIDES);
    }
    
    state_entry ()
    {
        llListen(5, "", NULL_KEY, "");
    }
    
    listen (integer channel, string name, key id, string message)
    {
        if ( message == "fire on")
        {
            llSetTexture("21eeb911-d57a-6a7b-44cd-b9d905860ac6", 1); 
            llSetColor(<255,255,255>, 1);
            llSetAlpha(0.0, 1);
            llSetTextureAnim(ANIM_ON | SMOOTH | LOOP, 1,1,1,1.0, 1,9.25);
            }
        else if ( message == "fire off") 
        {
            llSetAlpha(100.0, ALL_SIDES);
        }
    }
} 

Appreciate the help!

Best,

Cristos

0.0 = transparent
1.0 = full solid

Thanks Newgate, much appreciated!

Best,

Cristos