var timer; 
var current_location = 1;
var next_location = 1; 
var pics_loaded = 0;
var onoff = 0;
var direction = 1;
var timeout_value;
var images = new Array;
var photo_urls = new Array;
var photo_captions = new Array;
var transitionNames = new Array;
var transitions = new Array;
var current_transition = 15;
var loop = 1;

photo_urls[1] = "images/image01.jpg";
photo_captions[1] = "This is a Test1";
photo_urls[2] = "images/image02.jpg";
photo_captions[2] = "This is a Test2";
photo_urls[3] = "images/image03.jpg";
photo_captions[3] = "This is a Test3";
photo_urls[4] = "images/image04.jpg";
photo_captions[4] = "This is a Test4";
photo_urls[5] = "images/image05.jpg";
photo_captions[5] = "This is a Test5";
photo_urls[6] = "images/image06.jpg";
photo_captions[6] = "This is a Test6";
photo_urls[7] = "images/image07.jpg";
photo_captions[7] = "This is a Test6";
photo_urls[8] = "images/image08.jpg";
photo_captions[8] = "This is a Test6";
photo_urls[9] = "images/image09.jpg";
photo_captions[9] = "This is a Test6";
photo_urls[10] = "images/image10.jpg";
photo_captions[10] = "This is a Test6";
photo_urls[11] = "images/image11.jpg";
photo_captions[11] = "This is a Test6";
photo_urls[12] = "images/image12.jpg";
photo_captions[12] = "This is a Test6";
photo_urls[13] = "images/image13.jpg";
photo_captions[13] = "This is a Test6";
photo_urls[14] = "images/image14.jpg";
photo_captions[14] = "This is a Test6";
photo_urls[15] = "images/image15.jpg";
photo_captions[15] = "This is a Test6";
photo_urls[16] = "images/image16.jpg";
photo_captions[16] = "This is a Test6";
photo_urls[17] = "images/image17.jpg";
photo_captions[17] = "This is a Test6";
photo_urls[18] = "images/image18.jpg";
photo_captions[18] = "This is a Test6";
photo_urls[19] = "images/image19.jpg";
photo_captions[19] = "This is a Test6";
photo_urls[20] = "images/image20.jpg";
photo_captions[20] = "This is a Test6";
photo_urls[21] = "images/image21.jpg";
photo_captions[21] = "This is a Test6";
photo_urls[22] = "images/image22.jpg";
photo_captions[22] = "This is a Test6";
photo_urls[23] = "images/image23.jpg";
photo_captions[23] = "This is a Test6";
photo_urls[24] = "images/image24.jpg";
photo_captions[24] = "This is a Test6";
photo_urls[25] = "images/image25.jpg";
photo_captions[25] = "This is a Test6";
photo_urls[26] = "images/image26.jpg";
photo_captions[26] = "This is a Test6";
photo_urls[27] = "images/image27.jpg";
photo_captions[27] = "This is a Test6";
photo_urls[28] = "images/image28.jpg";
photo_captions[28] = "This is a Test6";
photo_urls[29] = "images/image29.jpg";
photo_captions[29] = "This is a Test6";
photo_urls[30] = "images/image30.jpg";
photo_captions[30] = "This is a Test6";
photo_urls[31] = "images/image31.jpg";
photo_captions[31] = "This is a Test6";
photo_urls[32] = "images/image32.jpg";
photo_captions[32] = "This is a Test6";
photo_urls[33] = "images/image33.jpg";
photo_captions[33] = "This is a Test6";
photo_urls[34] = "images/image34.jpg";
photo_captions[34] = "This is a Test6";
photo_urls[35] = "images/image35.jpg";
photo_captions[35] = "This is a Test6";
photo_urls[36] = "images/image36.jpg";
photo_captions[36] = "This is a Test6";
photo_urls[37] = "images/image37.jpg";
photo_captions[37] = "This is a Test6";
photo_urls[38] = "images/image38.jpg";
photo_captions[38] = "This is a Test6";
photo_urls[39] = "images/image39.jpg";
photo_captions[39] = "This is a Test6";
photo_urls[40] = "images/image40.jpg";
photo_captions[40] = "This is a Test6";
photo_urls[41] = "images/image41.jpg";
photo_captions[41] = "This is a Test6";

transitions[0] = "progid:DXImageTransform.Microsoft.Fade(duration=1)";
transitions[1] = "progid:DXImageTransform.Microsoft.Blinds(Duration=1,bands=20)";
transitions[2] = "progid:DXImageTransform.Microsoft.Checkerboard(Duration=1,squaresX=20,squaresY=20)";
transitions[3] = "progid:DXImageTransform.Microsoft.Strips(Duration=1,motion=rightdown)";
transitions[4] = "progid:DXImageTransform.Microsoft.Barn(Duration=1,orientation=vertical)";
transitions[5] = "progid:DXImageTransform.Microsoft.GradientWipe(duration=1)";
transitions[6] = "progid:DXImageTransform.Microsoft.Iris(Duration=1,motion=out)";
transitions[7] = "progid:DXImageTransform.Microsoft.Wheel(Duration=1,spokes=12)";
transitions[8] = "progid:DXImageTransform.Microsoft.Pixelate(maxSquare=10,duration=1)";
transitions[9] = "progid:DXImageTransform.Microsoft.RadialWipe(Duration=1,wipeStyle=clock)";
transitions[10] = "progid:DXImageTransform.Microsoft.RandomBars(Duration=1,orientation=vertical)";
transitions[11] = "progid:DXImageTransform.Microsoft.Slide(Duration=1,slideStyle=push)";
transitions[12] = "progid:DXImageTransform.Microsoft.RandomDissolve(Duration=1,orientation=vertical)";
transitions[13] = "progid:DXImageTransform.Microsoft.Spiral(Duration=1,gridSizeX=40,gridSizeY=40)";
transitions[14] = "progid:DXImageTransform.Microsoft.Stretch(Duration=1,stretchStyle=push)";
transitions[15] = "special case";
var transition_count = 15;
var photo_count = 38; 

var slideShowLow = "modules.php?set_albumName=springbreak2002&op=modload&name=Gallery&file=index&include=slideshow_low.php";

// Browser capabilities detection ---
// - assume only IE4+ and NAV6+ can do image resizing, others redirect to low 
if (is_ie4up || is_nav6up) {
    //-- it's all good ---
} else {
    //-- any other browser we go low-tech ---
    document.location = slideShowLow;
}

// - IE5.5 and up can do the blending transition.
var browserCanBlend = (is_ie5_5up);

function stopOrStart() {
    if (onoff) {
	stop();
    } else {
	play();
    }
}

function toggleLoop() {
    if (loop) {
	loop = 0;
    } else {
	loop = 1;
    }
}

function changeElementText(id, newText) {
    element = document.getElementById(id);
    element.innerHTML = newText;
}

function stop() {
    changeElementText("stopOrStartText", "Play");

    onoff = 0;
    status = "The slide show is stopped, Click [play] to resume.";
    clearTimeout(timer);

}

function play() {
    changeElementText("stopOrStartText", "Stop");

    onoff = 1;
    status = "Pauli Presents Slide Show is Now Playing...";
    go_to_next_photo();
}

function changeDirection() {
    if (direction == 1) {
	direction = -1;
	changeElementText("changeDirText", "forward");
    } else {
	direction = 1;
	changeElementText("changeDirText", "reverse");
    }
    preload_next_photo();

}

function change_transition() {
    current_transition = document.TopForm.transitionType.selectedIndex;
}

function preload_complete() {
}

function reset_timer() {
    clearTimeout(timer);
    if (onoff) {
	timeout_value = document.TopForm.time.options[document.TopForm.time.selectedIndex].value * 1000;
	timer = setTimeout('go_to_next_photo()', timeout_value);
    }
}

function wait_for_current_photo() {

    /* Show the current photo */
    if (!show_current_photo()) {

	/*
	 * The current photo isn't loaded yet.  Set a short timer just to wait
	 * until the current photo is loaded.
	 */
	status = "Picture is loading...(" + current_location + " of " + photo_count +
		").  Please Wait..." ;
	clearTimeout(timer);
	timer = setTimeout('wait_for_current_photo()', 500);
	return 0;
    } else {
	status = "Slide show is running...";
	preload_next_photo();
	reset_timer();
    }
}

function go_to_next_photo() {
    /* Go to the next location */
    current_location = next_location;

    /* Show the current photo */
    if (!show_current_photo()) {
	wait_for_current_photo();
	return 0;
    }

    preload_next_photo();
    reset_timer();
}

function preload_next_photo() {
    
    /* Calculate the new next location */
    next_location = (parseInt(current_location) + parseInt(direction));
    if (next_location > photo_count) {
	next_location = 1;
	if (!loop) {
	    stop();
	}
    }
    if (next_location == 0) {
        next_location = photo_count;
	if (!loop) {

	    stop();
	}
    }
    
    /* Preload the next photo */
    preload_photo(next_location);
}

function show_current_photo() {

    /*
     * If the current photo is not completely loaded don't display it.
     */
    if (!images[current_location] || !images[current_location].complete) {
	preload_photo(current_location);
	return 0;
    }
    
    /* transistion effects */
    if (browserCanBlend){
	var do_transition;
	if (current_transition == (transition_count)) {
	    do_transition = Math.floor(Math.random() * transition_count);
	} else {
	    do_transition = current_transition;
	}
	document.images.slide.style.filter=transitions[do_transition];
	document.images.slide.filters[0].Apply();
    }
    document.slide.src = images[current_location].src;
    setCaption(photo_captions[current_location]);

    if (browserCanBlend) {
	document.images.slide.filters[0].Play();
    }

    return 1;
}

function preload_photo(index) {

    /* Load the next picture */
    if (pics_loaded < photo_count) {

	/* not all the pics are loaded.  Is the next one loaded? */
	if (!images[index]) {
	    images[index] = new Image;
	    images[index].onLoad = preload_complete();
	    images[index].src = photo_urls[index];
	    pics_loaded++;
	}
    } 
}

function setCaption(text) {
    changeElementText("caption", "[" + current_location + " of " + photo_count + "] " + text);
}