\\ Place this script in the root prim.
default
{
    collision(integer num)
    {

        llSetLinkPrimitiveParamsFast(LINK_SET, [
                PRIM_GLOW, ALL_SIDES, 0.0,
            PRIM_LINK_TARGET, llDetectedLinkNumber(0),
                 PRIM_GLOW, ALL_SIDES, 1.0]);


    }


}