23 sel(void *aux)

    24 {

    25 	const char *arg = aux;

    26 	Client *c;

    27 

    28 	if(!arg || !stack)

    29 		return;

    30 	if(!strncmp(arg, "next", 5))

    31 		focus(stack->snext ? stack->snext : stack);

    32 	else if(!strncmp(arg, "prev", 5)) {

    33 		for(c = stack; c && c->snext; c = c->snext);

    34 		focus(c ? c : stack);

    35 	}

    36 }

    37 

    38 void