int byRandom(request_rec *r, ServerSlot *servers, int *n, char *arg) {
  /*  Returns n or n server as a random permutation of the input
      vector */

  int newcard, mycount, i;
  ServerSlot swap;
  static int rs=-1;
  newcard = *n;
  if(rs==-1) srand(time(NULL));
  mycount=0;
  for(i=0;i<newcard;i++) {
    rs = rand()%(*n-i);
    swap = servers[i];
    servers[mycount++] = servers[i+rs];
    servers[i+rs] = swap;
  }
  *n = mycount;
  return mycount;
}