var curpix = 0;
var curname;
var curtext;
var intervalId;
var curdisplay = 0;
var delay = 6000;
var run = 0;

function display(n)
{
  curpix = n;
  if (n == 0) {
    clearInterval(intervalId);
    parent.frames.display.location.href = 'pixindex.html';
  } else {
    curname = pix[curpix];
    curbig = big[curpix];
    curtext = txt[curpix];
    parent.frames.display.location.href = 'display.html';
  }
}

function next()
{
  curpix++;
  if (curpix > max) curpix = 1;
  display(curpix);
}

function prev()
{
  curpix--;
  if (curpix < 1) curpix= max;
  display(curpix);
}

function doStop()
{
  run = 0;
  clearInterval(intervalId);
}

function doStart()
{
  if (run == 0) {
    run = 1;
    next();
    intervalId = setInterval('javascript:next()', delay);
  }
}

function setDelay(n)
{
  delay = n;
  if (n == '4000') {
    document.images['4sec'].src = 'img/4sec_on.gif';
    document.images['6sec'].src = 'img/6sec_off.gif';
    document.images['10sec'].src = 'img/10sec_off.gif';
  }
  if (n == '6000') {
    document.images['4sec'].src = 'img/4sec_off.gif';
    document.images['6sec'].src = 'img/6sec_on.gif';
    document.images['10sec'].src = 'img/10sec_off.gif';
  }
  if (n == '10000') {
    document.images['4sec'].src = 'img/4sec_off.gif';
    document.images['6sec'].src = 'img/6sec_off.gif';
    document.images['10sec'].src = 'img/10sec_on.gif';
  }
  if (run == 1) {
    clearInterval(intervalId);
    intervalId = setInterval('javascript:next()', delay);
  }
}

display(curpix);