var curImg = 0;
var timerId = -1;
var intervalf = 3000;
var intervalm = 4500;
var intervals = 6000;
var interval = intervalm;
var imgIsLoaded = false;
var arrPreload = new Array();
var _PRELOADRANGE = 5;

function replaceNum(myinput, token, newstr)
{
    var input = myinput;
    var output = input;
    var idx = output.indexOf(token);
    if (idx > -1) 
  {
    output = input.substring(0, idx);
    output += newstr;
    output += input.substr(idx+token.length);
    }
    return output;
}

function changeSpeed(sidx)
{
    switch (sidx) 
  {
    case 0: interval = intervalm; break;
    case 1: interval = intervals; break;
    default: interval = intervalf;
    }
    if (timerId != -1) 
  {
    window.clearInterval(timerId);
    timerId = window.setInterval("forward();", interval);
    }
}

function preloadRange(intPic,intRange) {
  for (var i=intPic; i<intPic+intRange; i++) {
    arrPreload[i] = new Image();
    arrPreload[i].src = imageSrcArray[i];
  } 
  return true;
}

function imgLoadNotify()
{
    imgIsLoaded = true;
}

function changeSlide()
{
    if (document.all)
  {
      document.all.imgp.style.filter="blendTrans(duration=1)";
      document.all.imgp.filters.blendTrans.Apply();
    }
    imgIsLoaded = false;
    var htmlCont = "" +
  "<br><img border=1 src=\"" + imageSrcArray[curImg] + "\" alt=\"" + imageDateArray[curImg] + "\"";
    if (imageWidthArray[curImg] > 0 && imageHeightArray[curImg] > 0) 
  {
    htmlCont += (imageHeightArray[curImg]>410)?" height=410":" width=" + imageWidthArray[curImg] + " height=" + imageHeightArray[curImg];
    }
    htmlCont += " border=0 hspace=0 vspace=0 onload=\"imgLoadNotify();\">" + "<br>";
  htmlCont += "<br><span>" + imageNameArray[curImg] + "</span><br><small>" + imageCreatorArray[curImg] + "</small>";

    var pnumLine = "<small>";
    pnumLine += replaceNum(SHOWINGSTRING, "%slideNum", imageDescArray[curImg]);
    pnumLine += "</small>";
    document.getElementById("pem").innerHTML = pnumLine;
    document.getElementById("imgp").innerHTML = htmlCont;
    if (document.all) 
    document.all.imgp.filters.blendTrans.Play();
}

function forward()
{
  if (!arrPreload[curImg+1])
  {
    imgIsLoaded = false;
    imgIsLoaded = (curImg+_PRELOADRANGE<numImgs)?preloadRange(curImg+1,_PRELOADRANGE):preloadRange(curImg+1,numImgs-curImg-1);
  }    
  if (imgIsLoaded) 
  {
    curImg++;
    if (curImg >= numImgs)
    {
//      if (timerId == -1)
//      {
//        curImg = 0;
//        changeSlide();
//      }
//      else
//      {
        finish();
//      }
    }
    else
    {
      changeSlide();
    }
  }
}

function rewind()
{
  curImg--;
  if (curImg < 0)
//    curImg = numImgs - 1;
    finish();
  else
    changeSlide();
}

function stop()
{
    window.clearInterval(timerId);
    timerId = -1;
    //document.playbtn.src = buttonImgPfx + buttonOffArray[0];
   // document.stopbtn.src = buttonImgPfx + buttonOnArray[1];
    imgIsLoaded = true;
}

function play()
{
    if (timerId == -1) 
    timerId = window.setInterval('forward();', interval);
  //  document.playbtn.src = buttonImgPfx + buttonOnArray[0];
  //  document.stopbtn.src = buttonImgPfx + buttonOffArray[1];
}

function setButton(direction)
{
    imgIsLoaded = true;
    if (direction == 0) 
  {
    //document.prevbtn.src = buttonImgPfx + buttonOnArray[2];
    //window.setTimeout("document.prevbtn.src = buttonImgPfx + buttonOffArray[2];", 300);
    }
  else 
  {
    //document.fowdbtn.src = buttonImgPfx + buttonOnArray[3];
    //window.setTimeout("document.fowdbtn.src = buttonImgPfx + buttonOffArray[3];", 300);
    }
}

function finish()
{
  stop();

  if (typeof(slideshow_end_url) != "undefined")
  {
    if (interval == intervals)
      slideshow_end_url += "&.spd=1";
    else if (interval == intervalf)
      slideshow_end_url += "&.spd=3";
    document.location=slideshow_end_url;
  }
}