var Pic = new Array();    // picture file name
var PicW = new Array();   // picture width
var PicH = new Array();   // picture height
var PicC = new Array();   // picture comment

var preLoad = new Array();

Pic[0] = 'photos/20000607_australia/australia1.jpg';
PicW[0] = 466;
PicH[0] = 345;
PicC[0] = '  ';
preLoad[0] = new Image();
Pic[1] = 'photos/20000607_australia/australia10.jpg';
PicW[1] = 466;
PicH[1] = 326;
PicC[1] = '  ';
preLoad[1] = new Image();
Pic[2] = 'photos/20000607_australia/australia11.jpg';
PicW[2] = 326;
PicH[2] = 466;
PicC[2] = '  ';
preLoad[2] = new Image();
Pic[3] = 'photos/20000607_australia/australia12.jpg';
PicW[3] = 326;
PicH[3] = 466;
PicC[3] = '  ';
preLoad[3] = new Image();
Pic[4] = 'photos/20000607_australia/australia2.jpg';
PicW[4] = 466;
PicH[4] = 326;
PicC[4] = '  ';
preLoad[4] = new Image();
Pic[5] = 'photos/20000607_australia/australia3.jpg';
PicW[5] = 466;
PicH[5] = 326;
PicC[5] = '  ';
preLoad[5] = new Image();
Pic[6] = 'photos/20000607_australia/australia4.jpg';
PicW[6] = 313;
PicH[6] = 459;
PicC[6] = '  ';
preLoad[6] = new Image();
Pic[7] = 'photos/20000607_australia/australia5.jpg';
PicW[7] = 466;
PicH[7] = 326;
PicC[7] = '  ';
preLoad[7] = new Image();
Pic[8] = 'photos/20000607_australia/australia6.jpg';
PicW[8] = 466;
PicH[8] = 326;
PicC[8] = '  ';
preLoad[8] = new Image();
Pic[9] = 'photos/20000607_australia/australia7.jpg';
PicW[9] = 466;
PicH[9] = 326;
PicC[9] = '  ';
preLoad[9] = new Image();
Pic[10] = 'photos/20000607_australia/australia8.jpg';
PicW[10] = 466;
PicH[10] = 326;
PicC[10] = '  ';
preLoad[10] = new Image();
Pic[11] = 'photos/20000607_australia/australia9.jpg';
PicW[11] = 466;
PicH[11] = 326;
PicC[11] = '  ';
preLoad[11] = new Image();


// alert("111 preLoadPic ix = "+0+":::"+preLoad[0].name);

// Set slideShowSpeed (milliseconds)
var slideShowSpeed = 5000

// Agent sniffer shamelessly 'stolen' from the excellent X library from cross-browser.com
var xOp7=false,xOp5or6=false,xIE4Up=false,xNN4=false,xUA=navigator.userAgent.toLowerCase();
if(window.opera){
  xOp7=(xUA.indexOf('opera 7')!=-1 || xUA.indexOf('opera/7')!=-1);
  if (!xOp7) xOp5or6=(xUA.indexOf('opera 5')!=-1 || xUA.indexOf('opera/5')!=-1 || xUA.indexOf('opera 6')!=-1 || xUA.indexOf('opera/6')!=-1);
}
else if(document.layers) xNN4=true;
else {xIE4Up=document.all && xUA.indexOf('msie')!=-1 && parseInt(navigator.appVersion)>=4;}

// Duration of crossfade (seconds)
var crossFadeDuration = 1

// Specify the image files

var t = -1;
var pos = 0;
var posNext = 0;
var status_slideshow = 0;
var count_entry = 0;

var html;

function preLoadPic(index)
{
    if (index >= 0 && index < Pic.length)
    {
        if (preLoad[index].src == "")
        {
            preLoad[index].src = "albums/"+Pic[index];
            // alert("preLoadPic ix = "+index);
            // alert("preLoadPic");
        }
    }
    else
    {
        Alert("Error : invalid index.");
    }
}

function startSlideShow()
{
    if (Pic.length == 0)
    {
        // No picture to start slide show.
        Alert("Error : Pic.length is less than or equal to 0.");
    }
    else if (t == -1)
    {
        // Only when the slide show has not been started,
        // then start it.

        posNext = pos;

        if ((posNext+1) < Pic.length)
        {
            // Can increment var pos. Thus increment.
            posNext++;
        }
        else if ((posNext +1) >= Pic.length)
        {
            // Cannot increment var pos. Thus restart from beginning.
            posNext = 0;
        }

        status_slideshow = 1;
        count_entry = 0;

        playSlideShow();

        window.status='Starting Slide Show ... '+window.status;
    }
}

function playSlideShow()
{
    if (Pic.length <= 0)
    {
        endSlideShow();
        Alert("Error : Pic.length is less than or equal to 0.");
        return;
    }

    if (preLoad[posNext].src == "")
    {
        endSlideShow();
        Alert("Error : preLoad[posNext].src is empty");
        return;
    }

    if (! preLoad[posNext].complete)
    {
        // The next picture is not completely loaded.

        if (count_entry == 3)
        {
            // Already attempted 3 times. Abort.

            endSlideShow();
            window.status='Slide show halted. Connection speed is too slow.';
            Alert("Error : Connection speed is too slow for slide show.");
        }
        else
        {
            window.status='Loading Picture '+(posNext+1)+' of '+Pic.length+', '+Pic[posNext];

            if (count_entry > 0)
            {
                window.status = window.status + ', '+count_entry;
            }

            if (t == -1)
            {
                t = window.setInterval('playSlideShow();', 3000);
                // alert("timer started");
            }
        }
        count_entry++;
    }
    else
    {
        // The next picture has been completely loaded.
        // Show the next picture
        pos = posNext;
        count_entry = 0;
        changeSlide();
        window.status='Showing Picture '+(pos+1)+' of '+Pic.length;

        if (status_slideshow != 0 && (posNext+1) < Pic.length)
        {
            // Slide show is being played.
            // Preload the next picture.
            posNext++;
            preLoadPic(posNext);

            if (t == -1)
            {
                // Although it is now in the slide show mode, but
                // the timer has not been started. Thus, start it.
                t = window.setInterval('playSlideShow();', 3000);
            }
        }
        else
        {
            // Slide show is not being played OR slide show has ended.
            if (status_slideshow != 0)
            {
                window.status=window.status+', '+'Slide Show Ended.';
            }
            endSlideShow();
        }

        if (status_slideshow == 0)
        {
            // Not in slide show mode.
            // Also preload the next and the prev photo
            if ((pos+1) < Pic.length) preLoadPic(pos+1);
            if (pos > 0) preLoadPic(pos-1);
        }
    }
}

function endSlideShow()
{
    if (t != -1)
    {
        window.clearInterval(t);
        t = -1;
    }
    // window.status='';
    status_slideshow = 0;
}

function changeSlide()
{
    if (xIE4Up)
    {
        if (document.all)
        {
            //document.images.SlideShow.style.filter= "blendTrans(duration=crossFadeDuration)"
            document.all.SlideShow.style.filter="blendTrans(duration=1)";
            document.all.SlideShow.filters.blendTrans.Apply();
        }
    }

    writeInnerHTML();

    if (xIE4Up)
    {
        if (document.all)
        {
            document.all.SlideShow.filters.blendTrans.Play();
        }
    }

    displayComment();

    return true;
}

function writeInnerHTML()
{
    html = "";
    html += "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n";
    html += "<tr>\n";
    html += "<td align=\"center\" valign=\"middle\" width=\"466\" height=\"466\">\n";
    html += "<img src=\""+preLoad[pos].src+"\"";
    html += " height="+PicH[pos];
    html += " weight="+PicW[pos];
    html += " border=\"0\" hspace=\"0\" vspace=\"0\"";
    html += " />\n";
    html += "</td>\n";
    html += "</tr>\n";
    html += "</table>\n";
    document.getElementById("SlideShow").innerHTML = html;

    // alert(html);
}

function nextPhoto()
{
    endSlideShow();

    if ((pos+1) < Pic.length)
    {
        posNext = pos + 1;
        playSlideShow();
    }
}

function prevPhoto()
{
    endSlideShow();

    if (pos > 0)
    {
        posNext = pos - 1;
        playSlideShow();
    }
}

function firstPhoto()
{
    endSlideShow();

    posNext = 0;
    playSlideShow();
}

function lastPhoto()
{
    endSlideShow();

    if (Pic.length > 0)
    {
        posNext = Pic.length - 1;
        playSlideShow();
    }
}

function gotoPhoto(num)
{
    endSlideShow();

    if (num > 0 && num <= Pic.length)
    {
        pos = num - 1;

        if (preLoad[pos].src == "" || ! preLoad[pos].complete)
        {
            // The next picture is not completely loaded.
            preLoadPic(pos);
            writeInnerHTML();
            displayComment();
        }
        else
        {
            changeSlide();
        }

        // Also preload the next and the prev photo
        if ((pos+1) < Pic.length) preLoadPic(pos+1);
        if (pos > 0) preLoadPic(pos-1);
    }
}

function displayComment()
{
    html = "<b>Album 8 :  2000 June Australia Trip</b><br/>";
    html += "<small>Photo "+(pos+1)+" of "+Pic.length+"<br/>";
    html += PicC[pos];
    html += "</small>";

    document.getElementById("TitleAndComments").innerHTML = html;
}

function load()
{
    displayComment();

    // Display the first picture.
    gotoPhoto(1);

    // Preload the last picture.
    if (Pic.length>0) preLoadPic(Pic.length-1);
}