function picnext() {
  if (pnum < pics.length - 1)
    pnum = pnum + 1
  else
    pnum = 0
  picture.src = pics[pnum]
  caption.innerHTML = pcap[pnum]
  }

function picback() {
  if (pnum==0)
    pnum = pics.length - 1
  else
    pnum = pnum - 1
  picture.src = pics[pnum]
  caption.innerHTML = pcap[pnum]
  }

function picstart() {
  picture.src = pics[pnum]
  caption.innerHTML = pcap[pnum]
  }

function picsbldr(galnum, qpics) {      // gallery number, number of pictures
  for (var i=0; i<qpics; i++) {
    pics[i] = "image/bcrc";
    if (galnum < 10) pics[i] += "0";
    pics[i] += galnum;
    if (i < 9) pics[i] += "0";
    pics[i] += (i + 1);
    pics[i] += ".jpg";
    pcap[i] = "[" + (i + 1) + "/" + qpics + "]";
    }
  }