// 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;
   alert("Il tuo browser non supporta in modo completo lo slide show automatico.")
}

// - 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");
	document.images['slideplay'].src="/images/ico_slide_play.gif"

    onoff = 0;
    status = "Slide show è stata fermata, Click [ PLAY ] per ripartire.";
    clearTimeout(timer);

}


function play() {
    //changeElementText("stopOrStartText", "STOP");
	//document.images['slideplay'].src="/images/ico_slide_stop.gif"

    onoff = 1;
    //status = "Slide show attivo...";
    go_to_next_photo();
}

/*
function changeDirection() {
    if (direction == 1) {
	direction = -1;
	//changeElementText("changeDirText", "AVANTI");
    } else {
	direction = 1;
	//changeElementText("changeDirText", "INDIETRO");
    }
    preload_next_photo();
}

function setDirection(d) {
	direction = d;
    preload_next_photo();
}
*/

function setCurrentLocation(c) {
	 current_location = c;
}


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

function preload_complete() {
}

function reset_timer() {
    clearTimeout(timer);
    if (onoff) {
	//se uso menu a tendina
	//timeout_value = document.TopForm.time.options[document.TopForm.time.selectedIndex].value * 1000;
	//senza menu a tendina
	//timeout_value = document.TopForm.time.value*1000
	timeout_value = 2000
	timer = setTimeout('go_to_next_photo()', timeout_value);
    }
}


function wait_for_current_photo() {

    /* Show the current photo */
    if (!show_current_photo()) {
		clearTimeout(timer);
		timer = setTimeout('wait_for_current_photo()', 500);
		return 0;
    } 
	else {
		//status = "Slide show attivo...";
		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 + " / " + photo_count + "] " + text);
}
*/

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 = 0;
var loop = 1;

// tipi di transizione
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;