Change Texture when Under/Out of Water

default
{
    on_rez(integer n)
    {
        if(llGetAttached())
        {
            llSetTimerEvent(0.5);
        }
        else
        {
            llSetTimerEvent(0);
        }
    }

    timer()
    {
        vector pos = llGetPos();
        float water = llWater(ZERO_VECTOR);
        if(water > pos.z)//you are under water
        {
            llSetTexture("wet texture name/uuid",ALL_SIDES);
        }
        else
        {
            llSetTexture("dry texture name/uuid",ALL_SIDES);
        }
    }
}